Spin-Peierls transition in N-methyl-N-ethyl-morpholinium-ditetracyanoquinodimethanide [MEM-(TCNQ)2]

S. Huizinga, J. Kommandeur, G. A. Sawatzky, B. T. Thole, K. Kopinga, W.J.M. De Jonge, J. Roos

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Abstract

In this paper we reinterpret the magnetic-susceptibility data and present and discuss specificheat data on MEM-(TCNQ)2 in terms of a spin-Peierls transition theory. We find that the data can be described reasonably well by a mean-field spin-Peierls transition theory which suggests that at low temperatures the TCNQ chain should be tetramerized. The magnetic susceptibility above the transition temperature is shown to behave like a one-dimensional Heisenberg antiferromagnet. The consequences of this behavior on the relative magnitude of the on-site Coulomb interaction are discussed.

Original languageEnglish
Pages (from-to)4723-4732
Number of pages10
JournalPhysical Review B
Volume19
Issue number9
DOIs
Publication statusPublished - 1 Jan 1979

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