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TT: Fachverband Tiefe Temperaturen

TT 20: Correlated Electrons - Poster Session

TT 20.35: Poster

Mittwoch, 28. März 2007, 14:00–17:45, Poster A

Anisotropy of superconducting critical fields of α-(BEDT-TTF)₂KHg(SCN)₄ under pressure — •Sebastian Jakob, Karl Neumaier, Werner Biberacher, and Mark Kartsovnik — Walther-Meissner-Institut, Garching, Germany

Our previous studies of the "magnetic field - pressure - temperature" phase diagram of the layered organic conductor α-(BEDT-TTF)₂KHg(SCN)₄ have revealed an interesting interplay between a charge density wave (CDW) and a superconducting (SC) state [1]. At a critical pressure of 2.5 kbar the CDW state is completely suppressed and a sharp transition into a SC state is observed below 100 mK. For pressures below 2.5 kbar there is a coexistence of the superconducting and CDW state, but this is likely a spatially inhomogenous state. The neighbouring of a CDW and SC state is an interesting situation and rises questions about the nature of the superconductivity. We have therefore investigated the anisotropy of the critical fields at a pressure slightly above the critical one. The experiments were performed in a dilution refrigerator down to 25 mK. Two-axes rotation of the magnetic field allowed the exact determination of the anisotropy parallel and perpendicular to the layers, but also the inplane anisotropy.

[1] D. Andres, M. V. Kartsovnik, W. Biberacher, K. Neumaier, E. Schuberth, H. Müller, Phys. Rev. B 72, 174513 (2005).