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Dresden 2003 – scientific programme

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TT: Tiefe Temperaturen

TT 11: Postersitzung II (Metall-Isolator-Überg
änge, Phasenüberg
änge in Quantensystemen, Theorie: Systeme korrelierter Elektronen)

TT 11.13: Poster

Tuesday, March 25, 2003, 14:30–19:00, P2c, P2d

Superposition of the orbital quantization and Pauli effect in a charge-density-wave organic conductor α-(BEDT-TTF)2KHg(SCN)4 — •Mark Kartsovnik1, Dieter Andres1, Werner Biberacher1, and Pavel Grigoriev21Walther-Meissner-Institut, Bayerische Akademie der Wissenschaften, Walther-Meissner-Str. 8, 85748 Garching — 2L.D. Landau Institute for Theoretical Physics, 142432 Chernogolovka, Russia

The organic metal α-(BEDT-TTF)2KHg(SCN)4 undergoes a charge-density-wave (CDW) transition at Tc ≈ 8.5 K. Under a strong magnetic field the CDW0 groundstate is suppressed due to the Pauli (spin-splitting) effect and a new phase, CDWx, with a field-dependent CDW wavevector Q(B) is established. The critical field of the CDW0 → CDWx transition, Bk, decreases with tilting the field away from the direction perpendicular to the highly conducting layers. At high tilt angles 65<θ < 90 the resistivity and magnetization exhibit, with sweeping the field above B>Bk, a hysteretic structure reminiscent of a series of first order transitions. We propose this behavior to be caused by a novel manifestation of the orbital quantization effect on Q(B) under the conditions when the nesting of the Fermi surface is deteriorated by the Pauli effect.

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