Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

TT: Tiefe Temperaturen

TT 30: Postersitzung IV: Kritische Ph
änomene, Quantenstörstellen, niederdimensionale Systeme

TT 30.21: Poster

Donnerstag, 11. März 2004, 14:30–19:00, Poster A

Studies of a CDW system under hydrostatic pressure and high magnetic fields: from field-induced CDW transitions to superconductivity — •Dieter Andres, Mark Kartsovnik, Werner Biberacher, and Karl Neumaier — Walther-Meissner-Institut, Bayerische Akademie der Wissenschaften, Walther-Meissner-Str.8, 85748 Garching

In α-(BEDT-TTF)₂KHg(SCN)₄ a charge density wave (CDW) is formed below about 8 K. This extremely low transition temperature gives the unique possibility to study the B-T phase diagram in an extended range. Moreover, hydrostatic pressure is known to easily tune the nesting conditions of the CDW system.

We show how orbital and Pauli effects of magnetic field compete within the CDW state leading to new quantization phenomena of successive field-induced CDW transitions. Furthermore, a coexistence of superconductivity and CDW in a certain pressure range will be discussed.