Berlin 2008 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 32: Correlated Electrons: Poster Session

TT 32.65: Poster

Donnerstag, 28. Februar 2008, 14:00–18:00, Poster B

Two-channel conductivity in a layered organic metal characterized by a weakly incoherent interlayer transport regime. — •Mark V. Kartsovnik¹, Werner Biberacher¹, and Natalia D. Kushch² — ¹Walther--Meissner-Institut, Bayerische Akademie der Wissenschaften, Garching, Germany — ²Institute for Problems of Chemical Physics, Russian Acadedmy of Sciences, Chernogolovka, Russia

We report on detailed studies of the interlayer MR of the layered organic metal alpha-(BEDT-TTF)2KHg(SCN)4 performed on several crystals characterized by different crystal quality. The angular dependence of MR is found to undergo a crossover from the conventional classical behaviour at low magnetic fields to the anomalous one at high fields. The crossover cannnot be explained by the field-induced confinement model proposed earlier for (TMTSF)2PF6 [1]. We propose an alternative phenomenological model based on parallel coherent and incoherent contributions to the interlayer conductivity. The model is able to explain not only the observed crossover but also anomalous features found in a number of other layered metals situated in the transient region between the fully coherent and incoherent transport regimes.

[1] D. G. Clarke and S. P. Strong, Adv. Phys. 46 (1997) 545.