NMR Anomalies in Quasi-2D Organic Superconductors: Effects of Spin Fluctuations in a Fermi Liquid Approach |
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Authors: | S. Charfi-Kaddour R. Louati A. Ben Ali R. Bennaceur M. Héritier |
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Affiliation: | (1) Laboratoire de Physique de la Matière Condensée, Département de Physique, Faculté des Sciences de Tunis, Campus Universitaire, 1060 Belvédère, Tunis, Tunisia;(2) Laboratoire de Physique des Solides, associé au CNRS, Bâtiment 510, Université Paris-Sud, 91405 Orsay, France |
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Abstract: | The -(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 the normal state properties in a Fermi liquid approach using the RPA approximation. The calculated NMR relaxation rate exhibits a peak in 1/(T1T), which strongly decreases when the departure from perfect nesting of the Fermi surface and the bandwidth increase. These results are in good agreement with NMR experiments done in -(ET)2X at least qualitatively. In conclusion, we have shown that, in the normal state and with a Fermi liquid approach, the spin fluctuations, which are present in the system due to an imperfect nesting property of the Fermi surface, can induce anomalies of the magnetic properties. Besides, we can restore the usual behaviour like the Korringa law by increasing the bandwidth or by considering a more imperfect nesting. Our calculation reproduces qualitatively the applied pressure relaxation rate experiment done in -(ET)2X salt. |
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Keywords: | organic superconductors nonconventional mechanisms (spin fluctuations) band and itinerant models |
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