Regensburg 2016 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 58: Transport: Poster Session
TT 58.35: Poster
Mittwoch, 9. März 2016, 15:00–18:30, Poster D
Inplane anisotropy of the critical field of α-(BEDT-TTF)2MHg(SCN)4 (M = K, Tl) — •Michael Kunz1,2, Luzia Höhlein1,2, Sebastian Jakob1,2, Werner Biberacher1, Harald Müller3, Natalya Kushch4, and Mark Kartsovnik1 — 1Walther-Meißner-Institut, Garching, Deutschland — 2Technische Universität München, Garching, Deutschland — 3European Synchrotron Radiation Facility, Grenoble, France — 4Institute of Problems of Chemical Physics, Chernogolovka, Russia
The quasi-two-dimensional organic metals α-(BEDT-TTF)2MHg(SCN)4 (M = K, Tl) undergo a transition into a charge-density-wave (CDW) state with a transition temperature of TCDW ≈ 8.5 K for the K-compound and TCDW ≈ 10 K for the Tl-compound. At even lower temperatures an inhomogeneous superconducting (SC) state emerges with an onset temperature between 0.3 and 0.5 K. By applying pressure the CDW state can be completely suppressed, giving way to a homogeneous bulk SC state with a sharp transition. We present the azimuthal anisotropy of the upper critical field of α-(BEDT-TTF)2MHg(SCN)4 (M = K, Tl) studied at different pressures above and below the critical pressure where the CDW state is fully suppressed. The experimental results are analyzed in relation to multiple band contributions to SC pairing and possible manifestations of exotic superconductivity.