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MA: Fachverband Magnetismus

MA 15: Magnetism Poster A

MA 15.64: Poster

Dienstag, 2. April 2019, 10:00–13:00, Poster E

Quantum entanglement of charge and spin in frustrated κ-(BEDT-TTF)2Hg(SCN)2Br — •Mamoun Hemmida^1,2, Hans-Albrecht Krug von Nidda², Björn Miksch¹, Leonid Samoilenko¹, Andrej Pustogow¹, Sebastian Widmann², Alois Loidl², and Martin Dressel¹ — ¹1. Phys. Inst., Universität Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, Germany — ²EP V, EKM, Universität Augsburg, 86135 Augsburg, Germany

Detailed static and dynamic spin susceptibilities as well as transport investigations [1] of the two-dimensional frustrated organic metal κ-(BEDT-TTF)2Hg(SCN)2Br exhibit unusual properties below the metal-insulator transition temperature of 90 K of both charge and spin degrees of freedom. Such properties like weak ferromagnetism and glassy state seem to result from the dominant role of quantum fluctuations associated with frustration and disorder at low temperatures. Based on the experimental observations, a strong entanglement between spin and charge degrees of freedom has been suggested in Ref. 2. We gratefully acknowledge sample preparation and structural characterization by A. Henderson, T. Siegrist and J. A. Schlueter.

[1] T. Ivek et al., Phys. Rev. B 96, 085116 (2017).

[2] M. Hemmida et al., arXiv:1710.04028 (2017).