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O-30 39 Field-dependence of Competing AFM and SC in underdoped (Ba1-xKx)Fe2As2 R. R. Urbano 1 , E. Prettner 1 , W. G. Moulton 1 , A. P. Reyes 1 , P. L. Kuhns 1 , E. M. Bittar 2 , C. Adriano 2 , T. M. Garitezi 2 , L. Bufaiçal 2 , P. G. Pagliuso 2 1 National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida, 32306, USA. 2 Instituto de Física "Gleb Wataghin", UNICAMP, 13083-970, Campinas-SP, Brazil. We have investigated the electronic and magnetic properties of a high quality single crystal of (Ba0.84K0.16)Fe2As2 by bulk and high magnetic field NMR measurements. The magnetic susceptibility, the resistivity and the specific heat reveal a structural and an AFM transition around T0 = 110 K. Coexistence of AFM order and bulk SC is evident below Tc = 20 K as inferred from the 75As NMR spectra and spin-lattice relaxation rate, 1/T1. Based in our NMR results, the spin structure in the ordered state is determined to be AFM stripe-type in agreement with the neutron scattering data reported for the parent BaFe2As2. Surprisingly, the spontaneous internal hyperfine field Bint generated by the AFM order at the As site is enhanced by high magnetic fields with B perpendicular to the c-axis. As consequence, a possible enhancement of the ordered moment at the Fe site is suggested from our high field data. We thus conclude that the magnetic field may be considered as a tuning parameter on this material.
O-31 40 NMR study of the Tomonaga-Luttinger liquid state in the carbon nanotubes I. Ihara 1 , P. Wzietek 1 , H. Alloul 1 , M.H. R 2 , Th. Pichler 3 , F. Simon 4 1 Laboratoire de Physique des Solides, Universite Psris-Sud 11, UMR 8502, 91405 Orsay, France 2 IFW Dresden, PO Box 270116, D-01171 Dresde, Germany 3 University of Vienna, Faculty of Physics, Strudlhofgasse 4, A-1090 Wien, Austria 4 Budapest University of Technology and Economics, Institute of Physics and Condensed Matter Research Group, Hungarian Academy of Sciences, Post Office Box 91, H-1521 Budapest, Hungary Carbon nanotubes (CNT) are perfect candidates to realize 1D electronic systems, such as described by the Tomonaga-Luttinger Liquid theory. Although the TLL behavior in the electronic transport was reported for metallic CNT, conductivity measurements can be spoiled by contact effects such as Coulomb blocade. On the other hand, NMR provides a non invasive probe of the electronic properties of a bulk system such as CNT bundles. I will present 13C NMR studies of the single and double wall nanotubes. Namely, in the single wall species (SWCNT) the nuclear relaxation study reveals that spin excitations are gapless down to at least 6K and the characteristic power law dependence of 1/(T1T) could be followed over two decades in temperature. The observed exponent is smaller than expected in the two-band model used to describe the metallic CNT. The field dependence of the relaxation rate indicates a frequency dependence of the correlation function, however its origin remains unclear.
Page 1 and 2: ABSTRACT BOOK RECENT ADVANCES IN BR
Page 3 and 4: RECENT ADVANCES IN BROAD BAND SOLID
Page 9 and 10: INVITED LECTURES
Page 11 and 12: O-2 10 NMR in Quantum Spin Systems
Page 13 and 14: O-4 12 NMR and the quasi-one dimens
Page 15 and 16: O-7 14 NMR studies on the new iron
Page 17 and 18: O-9 16 NMR methods for investigatio
Page 19 and 20: O-10 18 Sodium cobaltates: A golden
Page 21 and 22: O-12 20 Broadband NMR at ultra high
Page 23 and 24: O-14 22 Strong Cu-O hybridization i
Page 25 and 26: O-16 24 Kagome Frustrated Antiferro
Page 27 and 28: O-18 26 Multiband Superconductivity
Page 29 and 30: O-20 28 Magnetic and physical prope
Page 31 and 32: O-21 30 NMR spin echo study of RF-I
Page 33 and 34: O-23 32 Clarification of Quantum Cr
Page 35 and 36: O-25 34 Nanoscale electronic order
Page 37 and 38: O-27 36 75 As NMR in Fe pnictide su
Page 39: O-29 38 NQR study of the phase segr
Page 43 and 44: POSTER CONTRIBUTIONS
Page 45 and 46: P-2 44 Cryogenic static and magic-a
Page 47 and 48: P-4 46 Nuclear Magnetic Resonance E
Page 49 and 50: P-6 48 Charge Induced Vortex Lattic
Page 51 and 52: P-8 50 77 Se NMR study of λ-(BETS)
Page 53 and 54: P-9 52 Electron spin relaxation in
Page 55 and 56: P-10 54 saturation field B c = 14.9
Page 57 and 58: P-12 56 Superionic Conductivity and
Page 59 and 60: P-14 58 NMR study of Quantum Critic
Page 61 and 62: P-16 60 Gap structure and vortex dy
Page 63 and 64: P-18 62 New Facility for Broadband
Page 65 and 66: P-20 64 Complex interplay of Ce 4f
Page 67 and 68: P-21 66 in our experiment. However,
Page 69 and 70: P-23 68 Observation of the Fermi Li
Page 71 and 72: P-25 70 Magnetic-field induced phas

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