Dresden 2006 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 25: Correlated Electrons - Poster Session

TT 25.5: Poster

Mittwoch, 29. März 2006, 14:30–18:30, P1

Field-induced charge-density-wave transitions under pressure in the organic metal α-(BEDT-TTF)₂KHg(SCN)₄ — •Werner Biberacher¹, Dieter Andres¹, Mark Kartsovnik¹, Ilya Sheikin², Harald Müller³, and Natalia Kushch⁴ — ¹Walther-Meissner-Institut, Garching, Germany — ²LNCMI, CNRS, BP 166, Grenoble, France — ³ESRF, BP 220, Grenoble, France — ⁴Institute of Problems of Chemical Physics, Chernogolovka, Russia

Hydrostatic pressure is a parameter that tunes the nesting conditions of the charge-density-wave (CDW) state existing in the organic metal α-(BEDT-TTF)₂KHg(SCN)₄. With pressure the CDW gradually becomes suppressed and above 2.5 kbar it does not exist any more at zero magnetic field. The orbital effect of the magnetic field is demonstrated to re-establish the density wave, while the orbital quantization induces different CDW states in different field intervals. In particular, we have found that hysteretic features characteristic of the first order field-induced CDW transitions become visible at much higher temperatures at certain orientations of the magnetic field. This is a direct evidence for the existence of this theoretically predicted effect.