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.