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Tiefe Temperaturen Mittwoch TT 24.35 Mi 14:30 Poster A Heavy Fermion CePd3: Coherent State Versus Kondo Holes — •Philipp Haas, Peter Weber, Konstantin Petukhov, Oleg Ushakov, Boris Gorshunov, and Martin Dressel — 1. Physikalisches Institut, Universität Stuttgart, 70550 Stuttgart The formation of the coherent heavy-fermion state in CePd3 is studied when doped with non-magnetic La. The La atoms act as Kondo-holes. Low-energy excitations are studied by dc, microwave, THz, and infrared measurements at temperatures from 5 K to 300 K. Pure CePd3 shows typical features for heavy-fermion systems in the conductivity spectra: A hybridization gap opens at around 1000 cm −1 ; below 50 cm −1 the optical conductivity increases. In addition, at microwave frequency a feature is detected which resembles an extremely small energy gap (≈ 2 cm −1 ). TT 24.36 Mi 14:30 Poster A Calculated de Haas-van Alphen quantities of CeMIn5 (M =Co, Rh, and Ir) compounds — •Saad Elgazzar, Ingo Opahle, Roland Hayn, and Peter M. Oppeneer — Leibniz-Institute of Solid State and Materials Research, P.O. Box 270016, 01171 Dresden We report a critical analysis of the electronic structures and de Haasvan Alphen (dHvA) quantities of the heavy-fermion superconductors CeCoIn5, CeRhIn5, and CeIrIn5. The electronic structures are investigated ab initio on the basis of full-potential band-structure calculations, adopting both the scalar and fully relativistic formulations within the framework of the local spin-density approximation (LSDA). In contrast to another recent study, in which a pronounced change of the Fermi surface due to relativistic effects and therefore the importance of relativistic interactions for the superconductivity was claimed, we find only minor relativistic modifications of the band structure in our calculations. The ab initio calculated dHvA quantities are in good agreement with experimental data for CeCoIn5 and CeInIn5, when we adopt the delocalized LSDA description for the Ce 4f states. For CeRhIn5, however, a better agreement with experiment is obtained when the Ce 4f electron is treated as a localized core electron. The implications for an emerging picture of the localization behavior of the 4f electron in these materials are discussed. We furthermore compare our calculated dHvA quantities with other recent relativistic calculations and discuss the differences between them. TT 24.37 Mi 14:30 Poster A Transport Properties of LaTiO3+x Films and Heterostructures — •Andreas Schmehl 1 , Frank Lichtenberg 1 , Darrell Schlom 2 , Hartmut Bielefeldt 1 , and Jochen Mannhart 1 — 1 Experimentalphysik VI, Elektronische Korrelationen und Magnetismus, Institut für Physik, Universität Augsburg, Universitätsstr. 1, D-86135 Augsburg, Deutschland — 2 Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802-5505, USA We report on the transport properties of LaTiO3+δ and LaTiO3.5 films. The LaTiO3+δ samples show metallic transport and several samples exhibit a hysteretic drop of resistance during cooldown at ∼240K. The ferroelectric LaTiO3.5 samples, grown in capacitor structures, have nonlinear, diode-like and hysteretic V(I)-characteristics. Two charge-controlled transport regimes are found, which can be utilized for switching the devices between two voltage states. TT 24.38 Mi 14:30 Poster A Eigenschaften von YbAl2 bei tiefen Temperaturen — •T. Görlach 1 , C. Pfleiderer 1 und H. v. Löhneysen 1,2 — 1 Physikalisches Institut, Universität Karlsruhe, D-76128 Karlsruhe — 2 Forschungszentrum Karlsruhe, Institut für Festkörperphysik, D-76021 Karlsruhe Die zwischenvalente Legierung YbAl2 hat bei tiefen Temperaturen eine Reihe interessanter Eigenschaften. So wurde bei Messungen oberhalb 100 K festgestellt, dass die Magnetisierung nur schwach temperaturabhängig ist und das für zwischenvalente Verbindungen typische Verhalten zeigt [1]. Wir präsentieren Messungen der Magnetisierung, des Widerstandes und der spezifischen Wärme im Temperaturbereich zwischen 1,5 und 300 K. Der elektrische Widerstand ist bei tiefen Temperaturen (T ≤ 20 K) proportional zu T 3 – ein auch bei anderen zwischenvalenten Verbindungen beobachtetes Verhalten. Die spezifische Wärme wird durch den Gitterbeitrag dominiert, weicht aber von der Debye-Funktion ab, was auf zusätzliche Anregungen hinweist. Die Magnetisierungsmessungen sind qualitativ konsistent mit älteren Messungen für T > 100 K und zeigen bei tieferen Temperaturen Curie-Verhalten. [1] A. Iandelli, A. Palenzona, Journal of the Less-Common Metals 29 (1972), 293 TT 24.39 Mi 14:30 Poster A Single crystal studies of a new ternary Europium pnictide EuZn2Sb2 — •F. Weber 1 , A. Cosceev 1 , A. Nateprov 1,2 , M. Uhlarz 1 , C. Pfleiderer 1 , and H. v. Löhneysen 1,3 — 1 Physikalisches Institut, Universität Karlsruhe, D-76128 Karlsuhe, Germany — 2 Institute of Applied Physics, Academei 5, MD-2028 Kishinev, Moldova — 3 Forschungszentrum Karlsruhe, Institut für Festkörperphysik, D-76021 Karlsruhe, Germany We report the synthesis and characterisation of a new ternary Europium pnictide EuZn2Sb2. Single crystals were grown by a solid state reaction of high-purity starting materials in carbon glass crucibles. The crystal structure was determined using powder x-ray diffraction. Single crystals were oriented using Laue x-ray diffraction. EuZn2Sb2 is isostructural with the hexagonal Yb compound YbZn2Sb2. The bulk properties were characterised in terms of measurements of the resistivity, magnetoresistance, Hall effect, specific heat and magnetisation. Pronounced features characteristic of antiferromagnetic order with TN = 13.3K are observed. For field parallel to the c-axis the antiferromagnetism is suppressed above 2.7T while it persists up to ∼ 4.7T for field in the basal plane. An analysis of the nature of the antiferromagnetic state as inferred from the bulk properties is presented. TT 24.40 Mi 14:30 Poster A Orbital and spin exchange in LiNiO2 — •Roland Hayn 1 , Daré Anne-Marie 1 , and Richard Jean-Louis 2 — 1 L2MP, Université Aix- Marseille, Fac. St. Jerôme, 13397 Marseille Cedex 20, France — 2 Centre de Physique Theorique, Luminy Case 907, 13288 Marseille Cedex 9, France We derive an effective orbital and spin exchange Hamiltonian using a perturbative approach to study the compound LiNiO2. We show that the inclusion of the trigonal crystal field splitting at the oxygen sites leads to the appearance of antiferromagnetic exchange integrals in deviation from the Goodenough-Kanamori-Anderson rules for this 90 degree bond. That gives a microscopic foundation for the recently observed coexistence of ferromagnetic and antiferromagnetic couplings in the orbitally frustrated state of LiNiO2. TT 24.41 Mi 14:30 Poster A High energy photoemission study on the Verwey transition in Fe3O4 — •David Schrupp 1 , Michael Sing 1,2 , Sigemasa Suga 2 , and Ralph Claessen 1 — 1 Institut für Physik, Universität Augsburg, 86135 Augsburg, Germany — 2 Department of Material Physics, Osaka University, Osaka 560-8531, Japan Magnetite (Fe3O4) undergoes a first-order phase transition called the Verwey transition (VWT). Although known for a long time the VWT is currently a matter of intensive debate questioning fundamental issues such as the charge ordering of Fe 2+ and Fe 3+ ions which is widely believed to be the driving mechanism of the VWT. We present a study of the VWT by valence band high energy photoemission. Compared to VUV PES this enhances the probing depth by at least a factor of 2 with surface effects greatly reduced. Nonetheless, we still observe subtle differences in the valence band spectra between differently prepared surfaces. While the spectra of sputtered, annealed, and post-oxidized (111) and (100) single crystal surfaces display a continuous temperature evolution through the Verwey temperature (TV ), a first order VWT is observed on surfaces obtained by fracturing a crystal at 40 K. The non-equilibrium atomic configuration of these surfaces is thus apparently rather bulk-like, whereas the annealed samples display strong surface relaxations. The spectra at T < TV of the fractured samples are identified as those of a correlated insulator with a gap of at least 150 meV, which at TV closes into a pseudogap situation. The absence of clear quasiparticle signatures characterizes the T > TV phase as an incoherent metal, consistent with transport and optical data. TT 24.42 Mi 14:30 Poster A Metal-Insulator transitions driven by magnetic field in halfdoped manganites — •Horacio Aliaga and Dieter Vollhardt — Institut fuer Physik, Universitaet Augsburg D-86135, Germany We study the first order transition between an antiferromagnetic (AF) charge-ordered (CO) insulator to a ferromagnetic (FM) metal under external applied magnetic field. The temperature variation of the charge gap and magnetization as a function of temperature for different magnetic
Tiefe Temperaturen Mittwoch fields are calculated using a model that considers the competition between double exchange (DE), super exchange (SE) and electron-phonon interactions. We show a comparison to transport and magnetization experiments in related compounds. TT 24.43 Mi 14:30 Poster A Comparison of LSDA+U calculations and photo emission data of Fe3O4 — •David Schrupp 1 , Ivan Leonov 1 , Alexander Yaresko 2 , Shigemasa Suga 3 , Vladimir Anisimov 4 , and Ralph Claessen 1 — 1 Institut für Physik, Universität Augsburg, 86135 Augsburg, Germany — 2 Max Planck Institute for Physics of Complex Systems, 01187 Dresden, Germany — 3 Department of Material Physics, Osaka University, Osaka 560-8531, Japan — 4 Institute of Metal Physics, Ekaterinburg GSP-170, Russia Magnetite, undergoes a first-order phase transition, reflected by an increase of electrical resistivity by two orders of magnitude, called the Verwey transition. Although known for a long time the Verwey transition is currently a matter of intensive debate questioning fundamental issues such as the charge ordering of Fe 2+ ions which is widely believed to be the driving mechanism of the Verwey transition. The LSDA+U calculations based on new structure refinements in the low temperature phase of magnetite result in a charge and orbitally ordered insulator. The self-consistent solution corresponding to charge order does not satisfy the widely-accepted Anderson condition of minimum electrostatic repulsion, but agrees with photoemission spectra, taken below the Verwey transition temperature. These spectra where obtained by using polished, sputtered, annealed and post-oxidized single crystals. The correct stoichiometry and longrange order of the thus prepared surfaces were proven by LEED, STM, and XPS. The samples were measured with high energy photoemission (¯hω ≈ 700 eV), which means an enhanced information depth. TT 24.44 Mi 14:30 Poster A Dimerization versus Orbital Moment Ordering in the Mott insulator YVO3 — •Peter Horsch1 , Giniyat Khaliullin1 und Andrzej M. Oles2 — 1Max-Planck-Institut f. Festkoerperforschung, D- 70569 Stuttgart, Germany. — 2Smoluchowski Institute of Physics, PL- 30059 Krakow, Poland. We investigate the magnetic and orbital ordering within the spinorbital model [1] for cubic vanadates using exact diagonalization in combination with mean-field theory [2]. Increasing Hund’s exchange JH triggers a crossover from the valence-bond orbital states to C-type antiferromagnetic (AF) phase, while a finite spin-orbit coupling induces the staggered component of magnetization which couples to the t2g orbital moments. Our results provide a qualitative explanation of the observed spin canting and large reduction of magnetization in the C-AF phase of YVO3 [3]. At finite temperature an orbital instability in the C-type antiferromagnetic phase induces modulation of magnetic exchange constants even in the absence of lattice distortions. This dimerization should be distinguished from a usual Peierls instability, as it emerges at finite temperatures (and vanishes at zero temperature) due to an interplay of quantum effects and thermal fluctuations, which open the way towards dimerized orbital- and spin-correlations. The calculated spin structure factor shows a magnon splitting at �q = (0, 0, π) due to the orbital di- 2 merization, similar to the spinwave dispersions measured by Ulrich et al. [1] G. Khaliullin, P. Horsch, A.M. Oles, Phys. Rev. Lett. 86,3879 (2001). [2] P. Horsch, G. Khaliullin, A.M. Oles, Phys. Rev. Lett. in print (2003). [3] C. Ulrich et al., Phys. Rev. Lett. in print (2003). TT 24.45 Mi 14:30 Poster A Orbital assisted metal insulator transition in VO2 — •L.H. Tjeng 1 , T. Koethe 1 , M.W. Haverkort 1 , Z. Hu 1 , A. Tanaka 2 , S. Streltsov 3 , M. Korotin 3 , V. Anisimov 3 , W. Reichelt 4 , H.H. Hsieh 5 , H.-J. Lin 5 , and C.T. Chen 5 — 1 II. Physikalisches Institut, Universität zu Köln — 2 ADSM, Hiroshima University, Japan — 3 IMP, Ekaterinburg, Russia — 4 Institut für Anorganische Chemie, Dresden — 5 NSRRC, Hsinchu, Taiwan VO2 is a non-magnetic oxide that undergoes a metal-to-insulator transition at 340 Kelvin. Above this temperature, VO2 is metallic and has a rutile (TiO2) structure (R-phase). At low temperatures, it is an insulator with a monoclinic structure (M1-phase), in which V-V pairs are formed. The long-standing debate about this compound concerns the nature of the metal-to-insulator transition. The issue is whether the non-magnetic insulating state would be regarded as a Peierls-insulator with the char- acter of a band insulator (one-electron picture), or whether it should be viewed as a Mott-insulator (many-body picture). We have used polarization dependent soft-X-ray absorbtion at the V L2,3 edges to investigate the local electronic structure of VO2, and have found that the V 3d orbital occupation symmetry changes dramatically across the metal-insulator transition. From a comparison with LDA and LDA+U calculations we infer that this phase transition is assisted by the orbital degrees of freedom, i.e. requiring an explanation beyond the classical Peierls mechanism. TT 24.46 Mi 14:30 Poster A Orbital occupation and momentum in LaTiO3 — •M.W. Haverkort 1 , Z. Hu 1 , H. Roth 1 , T. Lorenz 1 , C. de Nadai 2 , N.B. Brookes 2 , A. Tanaka 3 , H.H. Hsieh 4 , H.-J. Lin 4 , C.T. Chen 4 , and L.H. Tjeng 1 — 1 II. Physikalisches Institut, Universität zu Köln — 2 ESRF, Grenoble, France — 3 ADSM, Hiroshima, Japan — 4 NSRRC, Hsinchu, Taiwan LaTiO3 is an antiferromagnetic insulator with a magnetic ordering temperature of TN ≈ 145 K. Neutron measurements reveal a magnetic moment of 0.45 ∼ 0.57 µB, significantly less than the 1 µB expected for a S = 1 2 system (Ti = 3d1 ). One may envision that this discrepancy can be ascribed to the presence of an anti-parallel aligned orbital momentum in this quasi cubic material. However, neutron data also found an almost perfect isotropic spin wave spectrum with an extremely low spin gap, indicative for the absence of an orbital moment. An orbital liquid model is then proposed to explain these data. We have carried out detailed temperature dependent soft-x-ray absorption and circularly-polarized/spinresolved photoemission experiments. We find that the orbital moment is practically quenched, in agreement with the neutron spin wave data. Using the results from LDA and LDA+U calculations, we infer that this quenching is caused by non-cubic crystal fields associated with the small but non-negligible non-cubic distortions in LaTiO3. These crystal fields are much stronger than the spin-orbit interaction, and crucial for the explanation of the lineshape and the lack of temperature dependence of the spectra. It seems that these conditions do not favor the formation of an orbital liquid. TT 24.47 Mi 14:30 Poster A Orbital excitations in LaTiO3 and YTiO3 investigated by infrared and Raman spectroscopy — •A. Gössling 1 , R. Rückamp 1 , M. Grüninger 1 , M. Cwik 1 , H Roth 1 , T. Lorenz 1 , A. Freimuth 1 , B. Keimer 2 und C. Ulrich 2 — 1 II.Physikalisches Institut, Universität zu Köln — 2 Max-Planck-Institut FKF, Stuttgart There is still discussion about the puzzling compound LaTiO3 [1,2,3]. We compare LaTiO3 with orbitally ordered YTiO3 using IR and Raman spectroscopy. With IR we observe broad peaks at approximately 0.30 eV in both compounds, with Raman at 0.25 eV. The difference in energy is due to the simultaneous excitation of a phonon in IR spectroscopy, breaking the parity selection rule. This clearly reveals the even parity of the excitation, typical for orbital excitations. We discuss the origin of the peaks within the framework of different theoretical models. Supported by the DFG through SFB 608. [1] B.Keimer et al., Phys.Rev.Lett.85, 3946 (2000). [2] G.Khaliullin et al., Phys.Rev.Lett.85, 3950 (2000). [3] M.Cwik et al., Phys.Rev.B 68, 060401 (2003). TT 24.48 Mi 14:30 Poster A Search for orbital excitations in YTiO3: calculation of phonon dispersion relations — •M. Guennou 1 , C. Ulrich 1 , C. Frost 2 , S. Miyasaka 3 , Y. Taguchi 3 , Y. Tokura 3 , and B. Keimer 1 — 1 Max-Planck-Institut FKF, Stuttgart — 2 ISIS, Oxford, England — 3 Departement of Applied Physics, University of Tokyo, Japan The purpose of our study was to search for elementary excitations of the orbital magnetization, the so-called orbitons, in YTiO3. We have performed single crystal inelastic neutron scattering experiments up to high energies (350 meV) at the spectrometer MAPS at the ISIS facility in Oxford. In order to give an interpretation of the features observed at high energies, we have calculated the phonon dispersion relations and the first and higher order density of states. There is a good agreement between the calculated phonon dispersion relations and the first order phonon modes measured by neutron and Raman scattering. These results will be compared with the theoretical predictions for the orbital dispersion relations given by G. Khaliullin [1]. [1] G. Khaliullin et al., Phys.Rev.Lett. 89, 167201 (2002).
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Page 411 and 412: Tiefe Temperaturen Donnerstag pair
Page 413 and 414: Tiefe Temperaturen Donnerstag linea
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Page 417 and 418: Tiefe Temperaturen Donnerstag sowie
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Page 421 and 422: Tiefe Temperaturen Freitag Näherun
Page 423 and 424: Vakuumphysik und Vakuumtechnik Tage
Page 425 and 426: Vakuumphysik und Vakuumtechnik Mont
Page 427 and 428: Ausschuss Industrie und Wirtschaft
Page 429 and 430: Arbeitskreis Biologische Physik Tag
Page 431 and 432: Arbeitskreis Biologische Physik Tag
Page 433 and 434: Arbeitskreis Biologische Physik Mon
Page 435 and 436: Arbeitskreis Biologische Physik Die
Page 437 and 438: Arbeitskreis Biologische Physik Don
Page 439 and 440: Arbeitskreis Biologische Physik Fre
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Arbeitskreis Biologische Physik Fre
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Page 457 and 458:
Page 459 and 460:
Arbeitskreis Physik sozio-ökonomis
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Page 465 and 466:
Page 467 and 468:
Symposium Fat-Tail Distributions -
Page 469 and 470:
Symposium Life Sciences on the Nano
Page 471 and 472:
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Page 475 and 476:
Page 477 and 478:
Page 479 and 480:
Page 481 and 482:
Page 483 and 484:
Symposium Non-Fermi Liquids in Quan
Page 485 and 486:
Symposium Functional Nanoparticles
Page 487 and 488:
Symposium Organic and Hybrid System
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Page 491 and 492:
Page 493 and 494:
Page 495 and 496:
Page 497 and 498:
Page 499 and 500:
Page 501 and 502:
Page 503 and 504:
Page 505 and 506:
Page 507 and 508:
Symposium Physics of Foams Mittwoch
Page 509 and 510:
Symposium Physics of Foams Mittwoch
Page 511 and 512:
Symposium Quantum Shot Noise in Nan
Page 513 and 514:
Symposium X-RAY Magneto-Optics Tage
Page 515 and 516:
Symposium X-RAY Magneto-Optics Dien
Page 517 and 518:
Lehrertage Regensburg Hauptvorträg
Page 519 and 520:
A. D., Mirlin .................HL 1
Page 521 and 522:
Breidenbach, Boris ........ AKB 50.
Page 523 and 524:
Elli, Alexandra .............SYLS 3
Page 525 and 526:
Greer, Lindsay ......... M 9.1, M 1
Page 527 and 528:
Horn-von Hoegen, M. O 13.2, O 14.40
Page 529 and 530:
Korn, Tobias ...............MA 13.6
Page 531 and 532:
Martin, Tobias ............. MA 13.
Page 533 and 534:
Partyka, Ewa ................ M 18.
Page 535 and 536:
Rugeramigabo, Eddy Patrick O 14.38,
Page 537 and 538:
Sihler, J. .................... DS
Page 539 and 540:
Volz, K. .................... HL 44
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