International Workshop on Electronic Crystals
ECRYS - 93

J. Phys. IV France 03 (1993) C2-365-C2-368
DOI: 10.1051/jp4:1993273

Glass transition in the spin density wave phase of (TMTSF)₂PF₆ investigated by calorimetric measurements

J.C. LASJAUNIAS¹, J. ODIN¹, K . BILJAKOVIC^{1, 2}, P. MONCEAU¹ and K. BECHGAARD<sup>3

1</sup>  Centre de Recherches sur les Très Basses Températures, CNRS, Laboratoire associé à l'Université Joseph Fourier, BP. 166, 38042 Grenoble cedex 9, France
²  Institute of Physics of the University of Zagreb, P.O. Box 304, 41001 Zagreb, Croatia
³  Department of General and Organic Chemistry, H.C. Oersted Institute, 2100 Copenhagen, Denmark

Abstract
We report on detailed kinetic investigation of the specific heat anomaly of the spin density wave phase of (TMTSF)₂PF₆ in the temperature range 2.5-5K. We point out the crucial role of kinetic conditions and of previous thermal history, such as isothermal annealing, which causes large hysteretic phenomena. This gives strong support to the origin of the anomaly in a glass transition which can be described in the general framework of freezing of supercooled liquids. For the unannealed system, T_g = 3.45 K.

© EDP Sciences 1993