Spin-Peierls instability in Per2 [M(mnt)2] compounds probed by specific heat

G. BONFAIT; M.J. MATOS; R.T. HENRIQUES; M. ALMEIDA

doi:doi:10.1051/jp4:1993250

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


Page(s)		C2-251 - C2-254
DOI		https://doi.org/10.1051/jp4:1993250

International Workshop on Electronic Crystals
ECRYS - 93

J. Phys. IV France 03 (1993) C2-251-C2-254
DOI: 10.1051/jp4:1993250

Spin-Peierls instability in Per₂ [M(mnt)₂] compounds probed by specific heat

G. BONFAIT, M.J. MATOS, R.T. HENRIQUES and M. ALMEIDA

Departamento de Quimica, ICEN-LNETI, 2686 Sacavem codex, Portugal

Abstract
Specific heat measurements on Per₂ [M(mnt)₂] compounds with M=Pt and Au are reported. An anomaly was found in the Pt compound, ascribed to the magnetic ordering of the Pt(mnt)₂ chains as in the Spin-Peierls transition. The comparison of the two compounds enabled a precise determination of the magnetic specific heat. Results above the transition temperature are better fitted by the Ising model rather by the Bonner-Fisher calculations on the Heisenberg model.