An experimental reinvestigation of the thermodynamics of the field induced SDW in (TMTSF)2ClO4

U. SCHEVEN; W. KANG; P.M. CHAIKIN

doi:doi:10.1051/jp4:1993258

Numéro		J. Phys. IV France Volume 03, Numéro C2, Juillet 1993 International Workshop on Electronic Crystals ECRYS - 93


Page(s)		C2-287 - C2-292
DOI		https://doi.org/10.1051/jp4:1993258

International Workshop on Electronic Crystals
ECRYS - 93

J. Phys. IV France 03 (1993) C2-287-C2-292
DOI: 10.1051/jp4:1993258

An experimental reinvestigation of the thermodynamics of the field induced SDW in (TMTSF)₂ClO₄

U. SCHEVEN, W. KANG and P.M. CHAIKIN

Department of Physics, Princeton Universty, Princeton NJ 08544, U.S.A.

Abstract
The unique nature of the spin density wave transitions induced by a moderate magnetic field in the Bechgaard salts (TMTSF)₂X (where X = PF₆ ClO₄, etc.) result from competition between the length scales set by the magnetic field and the SDW wavevector and possibly the lattice periodicity. This complex competition has led to experimental and theoretical suggestions of a phase diagram with some novel features including reentrance, arborescence and multicritical points. We have performed high resolution heat capacity and magnetocaloric measurements to reinvestigate these questions. We find no evidence for arborescence, but clear evidence of low field reentrance and a tetracritical point (as in previous work by Pesty et al.) indicating coexistence of order parameters for several FISDW phases.