Regensburg 2004 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 30: Postersitzung IV: Kritische Ph
änomene, Quantenstörstellen, niederdimensionale Systeme
TT 30.25: Poster
Donnerstag, 11. März 2004, 14:30–19:00, Poster A
κ-(BEDT-TTF)2Cu(SCN)2: Comparative Analysis of Tc and Magnetotransport Measurements under Pressure — •A.-K. Klehe1, T. Biggs1, C.A. Kuntscher1,2, A.M. Kini3, and J.A. Schlueter3 — 1Clarendon Laboratory, Dept. of Physics, Oxford University, Parks Road, Oxford OX1 3PU, U.K. — 21. Physikalische Institut, Universitaet Stuttgart, Pfaffenwaldring 57, D-70550 Stuttgart — 3Materials Science Division, Argonne National Laboratory, 9700
Magnetotransport measurements under pressure on the organic superconductor κ-(d8−BEDT-TTF)2Cu(SCN)2 with Helium as a pressure medium are compared to other measurements of the superconducting transition temperature, Tc, with the same pressure medium as well as magnetotransport measurements using other quasi-hydrostatic pressure media. The exact pressure dependence of the physical properties in κ-(BEDT-TTF)2Cu(SCN)2 depends on the pressure medium used, indicating that small degrees of non-hydrostaticity can strongly affect the results. A strong correlation between Tc and the quasi 2-dimensional carrier density in κ-(BEDT-TTF)2Cu(SCN)2 is seen, when comparing measurements of Tc to Fermi surface parameters. The suppression of Tc with pressure can be correlated to the transfer of carriers from the quasi 1-dimensional to the quasi 2-dimensional Fermi surface sections, thus revealing a mechanism reminiscent of Cuprate superconductors, where pressure is known to transfer carriers from the insulating charge reservoir layers into the conducting cuprate sheets.