Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 16: Poster Session Superconductivity, Cryogenic Particle Detectors, Cryotechnique

TT 16.17: Poster

Montag, 16. März 2020, 15:00–19:00, P2/EG

Angular-dependent specific heat of the organic superconductor κ-(BEDT-TTF)2Cu(NCS)2 — •T. Reimann1, H. Kühne1, J. A. Schlueter2, and J. Wosnitza1,31Hochfeld-Magnetlabor Dresden (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany — 2Division of Materials Research, National Science Foundation, Alexandria, VA 22314, USA — 3Institut für Festkörper- und Materialphysik, TU Dresden, D-01062 Dresden, Germany

The layered organic superconductor κ-(BEDT-TTF)2Cu(NCS)2 (Tc≈ 9.4 K) has recently gained strong interest because macroscopic, such as specific heat and magnetic torque, as well as microscopic NMR studies indicate the formation of a Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state above the Pauli-limit of BP≈ 21 T (For a recent review, see [1]). However, details about the nature of the phase transition remained controversial, since already a small off-alignment α of the superconducting layers to the magnetic field gives rise to orbital effects and reduces Tc considerably. Here, we present angular-resolved specific heat measurements in fields ranging from 0 to 22 T, covering the conventional superconducting as well as the FFLO state. For strictly parallel alignment, a sharpening of the superconducting transition accompanied by an upturn of Tc(B) clearly hallmarks the FFLO state above BP. However, for 0.5≤α≤3.5, pronounced first-order transitions appear slightly below Tc possibly indicating melting of the vortex lattice. [1] J. Wosnitza, Ann. Phys. 530, 1700282 (2018)

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