NMR Anomalies in Quasi-2D Organic Superconductors: Effects of Spin Fluctuations in a Fermi Liquid Approach
作者： S. Charfi-Kaddour , R. Louati , A. Ben Ali , R. Bennaceur , M. Héritier
关键词: Fermi liquid theory 、 Fermi level 、 Fermi surface 、 Physics 、 Quantum oscillations 、 Fermi energy 、 Superconductivity 、 Condensed matter physics 、 Fermi gas 、 Two parameter
摘要: The κ-(BEDT-TTF)2X organic superconductors are described by a two parameter 2D Fermi surface model, in which bandwidth and departure from perfect nesting can be varied. We have studied the spin fluctuations effect on normal state properties liquid approach using RPA approximation. calculated NMR relaxation rate exhibits peak 1/(T1T), strongly decreases when of increase. These results good agreement with experiments done κ-(ET)2X at least qualitatively. In conclusion, we shown that, approach, fluctuations, present system due to an imperfect property surface, induce anomalies magnetic properties. Besides, restore usual behaviour like Korringa law increasing or considering more nesting. Our calculation reproduces qualitatively applied pressure experiment salt.
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sci-hub.se 参考文章(11)
Aravinda M Kini, Urs Geiser, Hau H Wang, K Douglas Carlson, Jack M Williams, WK Kwok, KG Vandervoort, James E Thompson, Daniel L Stupka, None, A new ambient-pressure organic superconductor, .kappa.-(ET)2Cu[N(CN)2]Br, with the highest transition temperature yet observed (inductive onset Tc = 11.6 K, resistive onset = 12.5 K) Inorganic Chemistry. ,vol. 29, pp. 2555- 2557 ,(1990) , 10.1021/IC00339A004
V. Kataev, G. Winkel, D. Khomskii, D. Wohlleben, W. Crump, K.F. Tebbe, J. Hahn, ESR of single crystals of κ-(BEDT-TTF)2Cu[N(CN)2]X (X = Br and I) Solid State Communications. ,vol. 83, pp. 435- 439 ,(1992) , 10.1016/0038-1098(92)90084-M
J. M. WILLIAMS, A. J. SCHULTZ, U. GEISER, K. D. CARLSON, A. M. KINI, H. H. WANG, W.-K. KWOK, M.-H. WHANGBO, J. E. SCHIRBER, Organic superconductors--new benchmarks. Science. ,vol. 252, pp. 1501- 1508 ,(1991) , 10.1126/SCIENCE.252.5012.1501
A. Kawamoto, K. Miyagawa, Y. Nakazawa, K. Kanoda, 13C NMR Study of Layered Organic Superconductors Based on BEDT-TTF Molecules. Physical Review Letters. ,vol. 74, pp. 3455- 3458 ,(1995) , 10.1103/PHYSREVLETT.74.3455
K. Kanoda, K. Miyagawa, A. Kawamoto, Y. Nakazawa, NMR relaxation rate in the superconducting state of the organic conductor κ-(BEDT-TTF) 2 Cu[N(CN) 2 ]Br Physical Review B. ,vol. 54, pp. 76- 79 ,(1996) , 10.1103/PHYSREVB.54.76
Jack M. Williams, Aravinda M. Kini, Hau H. Wang, K. Douglas Carlson, Urs Geiser, Lawrence K. Montgomery, Gloria J. Pyrka, Diana M. Watkins, Jefferson M. Kommers, From semiconductor-semiconductor transition (42 K) to the highest-Tc organic superconductor, κ-(ET)2Cu[N(CN)2]Cl (Tc = 12.5 K) Inorganic Chemistry. ,vol. 29, pp. 3272- 3274 ,(1990) , 10.1021/IC00343A003
H Mayaffre, P Wzietek, C Lenoir, D Jérome, P Batail, 13C NMR Study of a Quasi-Two-Dimensional Organic Superconductor κ-(ET)2Cu[N(CN)2]Br EPL. ,vol. 28, pp. 205- 210 ,(1994) , 10.1209/0295-5075/28/3/009
N. Bulut, D. J. Scalapino, S. R. White, Comparison of Monte Carlo and diagrammatic calculations for the two-dimensional Hubbard model. Physical Review B. ,vol. 47, pp. 2742- 2753 ,(1993) , 10.1103/PHYSREVB.47.2742
N. F. Berk, J. R. Schrieffer, Effect of Ferromagnetic Spin Correlations on Superconductivity Physical Review Letters. ,vol. 17, pp. 433- 435 ,(1966) , 10.1103/PHYSREVLETT.17.433
Junjiro Kanamori, Electron Correlation and Ferromagnetism of Transition Metals Progress of Theoretical Physics. ,vol. 30, pp. 275- 289 ,(1963) , 10.1143/PTP.30.275