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Low-Dimensional Critical Behaviors and Competition Between Order Parameters in the Organic Metal (Tmtsf)2ClO4

Published online by Cambridge University Press:  25 February 2011

F. Pesty ,
P. Garoche  and
M. Heritier
F. Pesty
Affiliation:
Laboratoire de Physique des Solides, Associé au C.N.R.S., U.P.S., Beit 510 91405 Orsay Cedex, (FRANCE)
P. Garoche
Affiliation:
Laboratoire de Physique des Solides, Associé au C.N.R.S., U.P.S., Beit 510 91405 Orsay Cedex, (FRANCE)
M. Heritier
Affiliation:
Laboratoire de Physique des Solides, Associé au C.N.R.S., U.P.S., Beit 510 91405 Orsay Cedex, (FRANCE)
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Abstract

In low-dimensional conductors, the instability of the metallic state can lead to the formation at low temperature of a spin density wave induced by the magnetic field (FISDW). The transition results from the complex interplay between the one dimensional instability of the electronic gas and the quantization of the magnetic field’s flux. This second-order phase-transition line has been investigated by measuring both specific heat and thermal conductivity along the c* direction. The mean-field jump and the gap value have been deduced respectively from the anomaly and the exponential decay of the electronic specific heat. The coupling strength λ has been evaluated, and the λ > 0.3 value indicates clearly a strong coupling behavior at high field. Below 8 teslas, the specific heat displays a double anomaly in relation with the competition between subphases. Above the second-order transition line, critical fluctuations are observed on both specific heat and lattice thermal conductivity. Along this line, one-dimensional fluctuations increase with increasing magnetic field. It is proposed that the very high field reentrance of the metal is to be related to enhancement of the 1D fluctuations.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 173: Symposium Q – Advanced Organic Solid State Materials , 1989 , 205
Copyright
Copyright © Materials Research Society 1990

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References

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