Regensburg 2016 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 58: Transport: Poster Session

TT 58.31: Poster

Mittwoch, 9. März 2016, 15:00–18:30, Poster D

Resistance study of the unusual metal-insulator-transition in the organic charge-transfer salt κ-(BEDT-TTF)₂Hg(SCN)₂Cl — •C. Delleske¹, D. Zielke¹, E. Gati¹, H. Schubert¹, J.A. Schlueter², and M. Lang¹ — ¹Physikalisches Institut, SFB TR 49, Goethe Universität, 60438 Frankfurt, Germany — ²Materials Science Division, Argonne National Laboratory, Argonne, IL 60439, USA

Materials close to a correlation-driven metal-insulator transition are known to show a variety of intriguing phenomena such as anomalous metallic and superconducting states. The organic charge-transfer salts of the BEDT-TTF family provide an ideal playground for studying the interplay between metallic and insulating phases, because of the simultaneous action of on-site and inter-site Coulomb repulsion and their low-dimensionality. Recently, κ-(BEDT-TTF)₂Hg(SCN)₂Cl has attracted particular interest since it shows a metal-insulator transition at T_MI = 30 K which has been assigned to charge order [1] , in combination with very strong frustration (t^′/t = 0.84) [2]. In this contribution, we investigate the in-plane resistivity of crystals which have been grown in our own laboratory. We show that the resistivity jump at the transition is as high as reported in literature [3] indicating comparable high quality of our crystals. A significant hysteresis at the phase transition can be observed in contrast to literature results [3]. Furthermore, we discuss anomalous hysteresis effects in the metallic state.

[1] N. Drichko et al., PRB 89, 075133 (2014)

[2] H. Jeschke, private communication

[3] S. Yasin et al., Physica B 407, 1689 (2012).