Phys. Rev. B 19, 4723–4732 (1979)Spin-Peierls transition in N-methyl-N-ethyl-morpholinium-ditetracyanoquinodimethanide [MEM-(TCNQ)2]Received 21 June 1978; published in the issue dated 1 May 1979 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. © 1979 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.19.4723
DOI:
10.1103/PhysRevB.19.4723
PACS:
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