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Tiefe Temperaturen Montag Ternary rare earth (Gd1/3Eu1/3Nd1/3)Ba2Cu3Oy (GEN123) thin films are prepared with off-axis laser ablation technique. Compared with monorare earth 123 films, GEN123 films show higher critical current density (Jc) and improved irreversibility field (Hirr), but no increase in the characteristic field corresponding to a crossover from low-field plateau to a linear region in logJc-logH plot. At intermediate fields, Jc vs. H scales as H −0.5 for GEN123, in contrast to H −0.73 for mono-rare earth samples such as Gd123. The slow power decay of Jc vs. H together with the improved Jc and Hirr strongly imply the extra flux pinning centres existing in GEN123, which are suggested to be non-correlated stress field induced by lattice mismatch. TT 8.5 Mo 14:30 Poster A High magnetic field test facilities at the Forschungszentrum Karlsruhe — •Hanno Leibrock, Frank Hornung, Marion Kläser, Hans Müller, Astrid Rimikis, and Theo Schneider — Institut für Technische Physik, Forschungszentrum Karlsruhe GmbH, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen Since more than 20 years the high-field laboratory (HFL) of the Institute for Technical Physics at the Forschungszentrum Karlsruhe develops, constructs and operates superconducting high-field magnets. During this period we achieved, inter alia, the world record of 20.1 Tesla for a superconducting magnet system (HOMER 1, 1987) and introduced the world’s first commercial 750 MHz, 800 MHz and 900 MHz NMR-spectrometer, together with our industrial partner Bruker Biospin. Current tasks of the HFL-group is the construction of the HOMER II test facility with magnetic fields up to 25 Tesla and a national BMBF-project for the development of a 1000 MHz NMR-spectrometer (23.5 Tesla) together with Bruker Biospin. Two experimental facilities, JUMBO (max. 15 Tesla) and HOMER I (max. 20.1 Tesla) exist in the high field laboratory for the required investigations in high magnetic fields. The first construction stage of the third facility, HOMER II, with a magnetic field of 20 Tesla in a bore of 180 mm diameter will start up soon. All setups, based on advanced superconducting magnets, are presented in this contribution. TT 8.6 Mo 14:30 Poster A Characterisation of advanced technical superconductors — •Marion Kläser, Frank Hornung, Hanno Leibrock, Hans Müller, and Theo Schneider — Institut für Technische Physik, Forschungszentrum Karlsruhe GmbH, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen By means of the high magnetic field test facilities in the high-field laboratory (HFL) at the Forschungszentrum Karlsruhe the superconducting properties of low (NbTi, Nb3Sn) and high (Bi2212, Bi2223) temperature superconductors were investigated at 1.8, 2.2 and 4.2 Kelvin in magnetic fields up to 20 Tesla. The electric field-current relation, E(I), is examined resistively using a high resolution four-point measurement technique. Detailed error analysis ensure the significance of the E(I)-characteristics and of the resultant critical current Ic and n-value. The outcomes are used e.g. to compare commercial conductors and to optimise the heat treatment of binary and ternary A15-superconductors. These investigations are the base for the development and construction of superconducting high-field magnets for experimental high-field test facilities and new generations of NMR spectrometers. TT 8.7 Mo 14:30 Poster A Herstellung und Charakterisierung von supraleitenden Zuleitungen aus Niob auf flexibler Polyimide-Folie — •Thomas Schneider 1 , Cornelia Assmann 2 , Jörn Beyer 2 und Thomas Schurig 2 — 1 FHTW Berlin — 2 PTB Berlin Bei experimentellen Aufbauten im Tieftemperaturbereich, insbesondere unterhalb 1 K, existieren bezüglich der mechanischen, elektrischen und thermischen Eigenschaften der eingesetzten Verdrahtung oftmals besondere Anforderungen. In vielen Fällen sind eine geringe thermische Leitfähigkeit, hohe elektrische Leitfähigkeit, Kompaktheit und mechanische Robustheit erforderlich. Darüber hinaus können zusätzliche Eigenschaften, wie z.B. definierter Wellenwiderstand oder niedrige Induktivität, notwendig sein. Streifenleiter basierend auf Dünnschichtstrukturen auf flexiblen Kunststoff-Folien können bei geeigneter Wahl der verwendeten Materialien viele dieser Eigenschaften kombinieren. In diesem Beitrag berichten wir über die Herstellung von Verdrahtungselementen bestehend aus supraleitenden Leitungen aus Niob auf Polyimide-Substraten. Dazu wird Polyimide-Folie mit einer Dicke von 0.125 mm beidseitig mit Niob- Dünnfilmen beschichtet. Nach Strukturierung des Niobs in Streifenlei- tergeometrie entstehen niederinduktive Verbindungsleitungen mit hoher Packungsdichte. Es werden technologische Aspekte sowie die supraleitenden Eigenschaften und die mechanische Zuverlässigkeit der Proben diskutiert. TT 8.8 Mo 14:30 Poster A Understanding grain boundary critical currents in high-Tc superconductors — •Karsten Guth, V. Born, S. Sievers, H. C. Freyhardt, and Ch. Jooss — Institut für Materialsphysik, Universität Göttingen, Tammannstr. 1, 37077 Göttingen Even more than 15 years after the discovery of high Tc superconductivity current suppression at grain boundary (GB) interfaces is one of the major problems for high current applications. Therefore, a detailed understanding of current transport across GBs is of great physical and technical interest. We performed a comparative study with thin films of the RE-123 (RE=Y, Y0.8Ca0.2, Yb, Er) system containing small angle GBs. By the manipulation of transport properties via Ca doping, rare earth ion size and the underlying substrate, we were able to directly influence GB properties such as the intergranular critical current. We used magneto-optical imaging (MOI) to map the magnetic fieldand current distribution across thin film GBs. With this space resolved characterisation technique it is further possible to study effects of the magnetic history on the inhomogeneous current distribution of wide current bridges. Additionally, via time resolved MOI the electric field distribution for magnetisation experiments could be calculated from the time-decay of the magentic field distribution, showing electric fields as small as 10 −8 V/m in these samples. Our measurements present different routes how to tailor GB properties in the future. TT 8.9 Mo 14:30 Poster A Magneto-optic imaging of superconducting transport currents in magnetic environments — •Harald Jarzina, Volker Born, Christian Jooss, Eva Brinkmeier, Karsten Guth, Wilko Westhäuser, and H. C. Freyhardt — Institut für Materialphysik, Tammannstrasse 1, 37073 Göttingen Magneto optic (MOI) imaging provides a valuable tool for space and time resolved measurements of the flux density distribution of superconducting films. For technological applications such as coated conductors, the investigation of transport currents is of special interest. In coated conductors, grain boundaries are the main reason for current suppression. In this work, we present flux and current-density distributions of YBa2Cu3O7 strips on single and bicrystalline substrates with an applied transport current. We discuss the change in the flux density distribution if a soft magnetic material is brought into the vicinity of the film. In the case of magnetization currents, the presence of soft magnetic material at the edges of the superconductor can prevent flux entry into the superconductor, thus stabilizing the Meissner phase up to higher external fields. Thereby current densities larger than the pinning determined critical current density jc can be obtained. TT 8.10 Mo 14:30 Poster A Modifying the current distribution of grain boundaries — •Eva Brinkmeier, Harald Jarzina, Karsten Guth, Volker Born, and Christian Jooss — Institut fuer Materialphysik, Universitaet Goettingen, Tammanstrasse 1, 37077 Goettingen The current distribution in thin superconducting films can be tailored by field conditioning via magnetic surroundings [1]. A soft magnet put parallel to a thin film edge can reduce or prevent the flux entry and therfor stabilise Meissner screening currents in the film. This is particularly interesting for the investigations of transport currents across grain boundaries in high temperature superconductors, where the critical current density sometimes strongly depends on the flux which penetrates into the grain boundary. Furthermore using special magnetic arrangements, asymmetric flux and current distributions can be tailored. We show, that flux penetration into grain boundary can be suppressed up to a certain external field H ∗ , which depends on the temperature and on the angle of the grain boundary. All investigations were done by magneto-optical imaging and the inversion of Biot and Savart. [1] H.Jarzina, Ch. Jooss and H.C. Freyhardt, J. Appl. Phys. 91 (2002) 3775
Tiefe Temperaturen Montag TT 8.11 Mo 14:30 Poster A Finite size effects and JC simulations in high-JC coated conductors — •J. Hänisch, L. Fernández, C. Cai, V.S. Sarma, L. Schultz und B. Holzapfel — IFW Dresden, Helmholtzstr. 20, 01069 Dresden, Germany The superconducting layer in coated conductors consists a network of small angle grain boundaries. Due to the limitation of JC on grain boundaries in high-TC superconductors, the current flow through this network is of percolative nature and depends on misorientation angle distribution, width and length of the tape and grain shape. The current flow through grain boundary networks had been simulated widely with purely statistical models on artificial networks. Recent investigations of biaxially textured orthorhombic materials (as YBCO on coated conductors is) showed a nonrandom distribution of misorientation angles in this materials. JC simulations using a fast and simple limiting-path algorithm were used to investigate the influence of the grain boundary misorientation statistics on JC in realistic networks. Input of the simulation program are large EBSD (electron back scattering diffraction) maps and the misorientation angle dependence of JC. We found a strong dependence of JC on the bridge width for bridges smaller then 20 grains (in comparisson to purely statistical models), whereas JC is not strongly varying for wider bridges. In rotating the whole EBSD map, we could simulate the influence of the grain aspect ratio on JC. In current direction elongated grains show significantly higher JC values. Both these results are promissing for the performance of coated conductors. TT 8.12 Mo 14:30 Poster A Coated Conductors by Inclined Substrate Deposition — •A. Lümkemann 1 , J. Handke 1 , H. Kinder 1 , R. Nemetschek 2 , C. Hoffmann 2 , G. Sigl 2 , and W. Prusseit 2 — 1 TU München, Physik Department E10, 85748 Garching — 2 THEVA Dünnschicht GmbH, Rote-Kreuz-Str. 8, 85727 Ismaning Thermal evaporation is one of the most promising techniques for economic industrial scale production of second generation HTS wire. The in-plane alignment of the RBCO film necessary for high critical current densities can be achieved by depositing biaxially textured buffer layers by inclined substrate deposition (ISD). The MgO buffer layer is grown at room temperature on electropolished Hastelloy tape by ISD using electron beam evaporation at roughly 3nm/s and inclination angle of 25 ◦ with respect to the substrate normal. This results in an in-plane alignment of 11 ◦ − 12 ◦ (FWHM). Meanwhile 33m long buffered Hastelloy tape has been fabricated using a 15 loop tape winder. HTS deposition is currently performed on 20m long and 1cm wide tape. Average critical current densities over several meters of tape are about 1.0MA/cm 2 at 77K, i.e. 100A/cm of transport current in a 1µm DyBCO film. We also present results on samples up to 20cm optained by HTSdeposition in static mode which can be summarized as follows: Dy- BCO on IBAD buffered tape exhibit critical current densities jc (77K) >2.0MA/cm 2 whereas MgO-ISD-buffer sustain jc in the range of 1.6MA/cm 2 . Ni5%W-RABiTS tape can carry up to 0.8 - 1.2MA/cm 2 . TT 8.13 Mo 14:30 Poster A YBCO thin films prepared by a Fluorine-free sol-gel method — •C. Apetrii 1 , I. v. Lampe 2 , M. Falter 1 , H. Schlörb 1 , B. Holzapfel 1 , and L. Schultz 1 — 1 IFW Dresden, Helmholtzstr. 20, 01069 Dresden — 2 TU Berlin, Institut für Werkstoffwissenschaften und -technologien, Englische Str. 20, 10587 Berlin The chemical solution deposition procedure is a low cost method due to non-vacuum approach for growing longer YBCO tapes. The polymer metal precursor technique, a fluorine-free sol-gel method, leads to a stable and non-aggressive precursor solution and also HF does not form during the process. HF is difficult to remove in precursor films prepared by the Trifluoracetates (TFA-method). Y, Ba, and Cu nitrates were chosen as a starting substances for the preparation of the polymer metal precursor to avoid the formation of BaCO3. The polymer metal precursor films were produced by spin coating of a stoichiometric solution onto SrTiO3 single crystal substrate and then dried at 170 ◦ C. The heat treatment was performed in a tube furnace with reaction temperature of 775 ◦ C. We obtained epitaxially grown 240 nm thick YBCO films on single crystal SrTiO3 with a resistively measured Tc of 89.9 K and ∆T of 2.0 K. The temperature dependence of the critical current density was measured using the standard 4 point geometry on 20 µm wide bridges and values of 10 5 A/cm 2 (at 77 K) were received. TT 8.14 Mo 14:30 Poster A Preparation of perovskite buffer layers on surface oxidized Ni tapes for coated conductor applications — •R. Hühne 1 , B. Holzapfel 1 , A. Kursumovic 2 , B. A. Glowacki 2 , J. E. Evetts 2 , A. Cavallaro 3 , F. Sandiumenge 3 , A. Pomar 3 , T. Puig 3 , and X. Obradors 3 — 1 IFW Dresden, Germany — 2 Department of Materials Science, University of Cambridge, UK — 3 Institut de Ciencia de Materials de Barcelona, Spain The preparation of cube textured NiO buffer layers on biaxially textured Ni tapes (RABiTS) using surface oxidation epitaxy (SOE) offers a cheap and scalable route for the production of long-length YBCO coated conductors. A second buffer layer is necessary to ensure epitaxial growth of the YBCO as well as to prevent Ni contamination of the superconducting layer. Therefore, different perovskite buffer were grown on SOE-NiO using pulsed laser deposition (PLD) and metal-organic decomposition (MOD). Ca0.6Sr0.4TiO3, BaZrO3 and SrZrO3 buffers were successfully deposited on NiO showing a high quality epitaxial growth with an in-plane orientation similar to the underlying NiO. The subsequent deposition of YBCO on top of these buffers using different methods resulted in epitaxial layers with a Tc0 above 83 K and jc up to 1 MA/cm −2 . Microstructural investigations showed that in all cases the roughness and the surface topography of the buffer layers is mainly determined by the quality of the NiO layer. TT 8.15 Mo 14:30 Poster A Ca- und Ag-dotierte YBCO-Filme aus Polymer-Metall- Precursoren auf STO und Ni-YSZ-Substrat — •Frank Zygalsky und Irene von Lampe — TU-Berlin, Inst. f. Werkstoffwissenschaften u. -technologien, Englische Str. 20, 10587 Berlin Die thermische Zersetzung von durch Spincoating erzeugten Polymer- Metall-Precursorschichten stellt ein verfahrenstechnisch unkompliziertes Schichtdepositionsverfahren zur epitaktischen Abscheidung von hochtemperatursupraleitenden Phasen dar. Ziel der Forschungsarbeit ist die Weiterentwicklung dieses kostengünstigen Nicht-Vakuum-Verfahrens hinsichtlich Epitaxiequalität und kritischer Stromdichte der erzeugten HTSL-Schichten. Dabei wird die Schichtabscheidung sowohl auf einkristallinen STO-Substraten als auch auf technisch relevanten biaxial texturierten Ni-Metallbändern mit YSZ-Pufferschicht betrachtet, sowie der Einfluß von Ca- und Ag-Dotierungen auf die supraleitenden Eigenschaften untersucht. TT 8.16 Mo 14:30 Poster A Superstructure on hightemperature superconductors (N=1,2,3) affirmed with STM — •Torsten Stemmler, Hendrik Glowatzki, and Recardo Manzke — Humboldt-Universität, Institut für Physik We present new pictures on HTCs from STM. TT 8.17 Mo 14:30 Poster A Oxygen superstructures throughout the phase diagram of (Y,Ca)Ba2Cu3O6+x — •Joerg Strempfer 1 , Ioannis Zegkinoglou 1 , Uta Ruett 1 , Martin von Zimmermann 2 , Christian Bernhard 1 , Chengtian Lin 1 , Thomas Wolf 3 , and Bernhard Keimer 1 — 1 Max-Planck-Institut fuer Festkoerperforschung, Heisenbergstr. 1, 70569 Stuttgart — 2 Hamburger Synchrotronstrahlungslabor HASYLAB at DESY, Notkestr. 85, 22603 Hamburg — 3 Forschungszentrum Karlsruhe, ITP, 76021 Karlsruhe Short-range lattice superstructures have been studied with high-energy x-ray diffuse scattering in underdoped, optimally doped, and overdoped (Y, Ca)Ba2Cu3O6+x. A new four-unit-cell superstructure was observed in compounds with x=0.92. The great similarity of the diffuse scattering pattern of the YBa2Cu3O6.92 compound with the one of Y0.8Ca0.2Ba2Cu3O6.95, which has approximately the same oxygen-content but different charge carrier concentration due to the Ca- substitution, clearly indicates that the origin of these superstructures lies in shortrange oxygen vacancy ordering rather than in electronic instabilities in the CuO2 layers. This is further supported by the absolute absence of any significant diffuse scattering in YBa2Cu4O8, a compound that contains no oxygen vacancies. The persistence of the diffuse reflections up to temperatures well above room temperature is also not in favour of the stripe-related scenario for their origin.
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Vakuumphysik und Vakuumtechnik Tage
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Vakuumphysik und Vakuumtechnik Mont
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Ausschuss Industrie und Wirtschaft
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Arbeitskreis Biologische Physik Tag
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Arbeitskreis Biologische Physik Tag
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Arbeitskreis Biologische Physik Mon
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Arbeitskreis Biologische Physik Die
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Arbeitskreis Biologische Physik Don
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Arbeitskreis Biologische Physik Fre
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Arbeitskreis Physik sozio-ökonomis
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Symposium Fat-Tail Distributions -
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Symposium Life Sciences on the Nano
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Symposium Non-Fermi Liquids in Quan
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Symposium Functional Nanoparticles
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Symposium Organic and Hybrid System
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Symposium Physics of Foams Mittwoch
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Symposium Physics of Foams Mittwoch
Page 511 and 512:
Symposium Quantum Shot Noise in Nan
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Symposium X-RAY Magneto-Optics Tage
Page 515 and 516:
Symposium X-RAY Magneto-Optics Dien
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Lehrertage Regensburg Hauptvorträg
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A. D., Mirlin .................HL 1
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Breidenbach, Boris ........ AKB 50.
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Elli, Alexandra .............SYLS 3
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Greer, Lindsay ......... M 9.1, M 1
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Horn-von Hoegen, M. O 13.2, O 14.40
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Korn, Tobias ...............MA 13.6
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Martin, Tobias ............. MA 13.
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Partyka, Ewa ................ M 18.
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Rugeramigabo, Eddy Patrick O 14.38,
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Sihler, J. .................... DS
Page 539 and 540:
Volz, K. .................... HL 44
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