Molecular-motion-induced order-disorder transition in MEM(TCNQ)2

S. Oostra; B. van Bodegom; S. Huizinga; G. A. Sawatzky; G. Gruner; J. P. Travers

doi:10.1103/PhysRevB.24.5004

Molecular-motion-induced order-disorder transition in MEM(TCNQ)2

S. Oostra^*, B. van Bodegom, S. Huizinga, G. A. Sawatzky, G. Gruner, J. P. Travers

^*Corresponding author for this work

Research output: Contribution to journal › Article › Academic › peer-review

10 Citations (Scopus)

Abstract

In this paper we present and discuss proton NMR results on N-methyl-N-ethyl-morpholinium tetracyanoquinodimethanide [MEM(TCNQ)2]. Between 280 and 320 K the MEM molecules show an order-disorder transition due to flipping of the MEM ions over 180°, causing an anomalous increase in the conductivity. At the 335-K phase transition to the metallic state, a rotation of the MEM ions, probably about the N—O axis, sets in. The entropy change due to this rotation plus that due to the added electronic degrees of freedom is in reasonable agreement with specific-heat data.

Original language	English
Pages (from-to)	5004-5013
Number of pages	10
Journal	Physical Review. B: Condensed Matter and Materials Physics
Volume	24
Issue number	9
DOIs	https://doi.org/10.1103/PhysRevB.24.5004
Publication status	Published - 1981

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Molecular-motion-induced order-disorder transition in MEM(TCNQ)2
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title = "Molecular-motion-induced order-disorder transition in MEM(TCNQ)2",

abstract = "In this paper we present and discuss proton NMR results on N-methyl-N-ethyl-morpholinium tetracyanoquinodimethanide [MEM(TCNQ)2]. Between 280 and 320 K the MEM molecules show an order-disorder transition due to flipping of the MEM ions over 180°, causing an anomalous increase in the conductivity. At the 335-K phase transition to the metallic state, a rotation of the MEM ions, probably about the N—O axis, sets in. The entropy change due to this rotation plus that due to the added electronic degrees of freedom is in reasonable agreement with specific-heat data.",

author = "S. Oostra and {van Bodegom}, B. and S. Huizinga and Sawatzky, {G. A.} and G. Gruner and Travers, {J. P.}",

year = "1981",

doi = "10.1103/PhysRevB.24.5004",

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T1 - Molecular-motion-induced order-disorder transition in MEM(TCNQ)2

AU - Oostra, S.

AU - van Bodegom, B.

AU - Huizinga, S.

AU - Sawatzky, G. A.

AU - Gruner, G.

AU - Travers, J. P.

PY - 1981

Y1 - 1981

N2 - In this paper we present and discuss proton NMR results on N-methyl-N-ethyl-morpholinium tetracyanoquinodimethanide [MEM(TCNQ)2]. Between 280 and 320 K the MEM molecules show an order-disorder transition due to flipping of the MEM ions over 180°, causing an anomalous increase in the conductivity. At the 335-K phase transition to the metallic state, a rotation of the MEM ions, probably about the N—O axis, sets in. The entropy change due to this rotation plus that due to the added electronic degrees of freedom is in reasonable agreement with specific-heat data.

AB - In this paper we present and discuss proton NMR results on N-methyl-N-ethyl-morpholinium tetracyanoquinodimethanide [MEM(TCNQ)2]. Between 280 and 320 K the MEM molecules show an order-disorder transition due to flipping of the MEM ions over 180°, causing an anomalous increase in the conductivity. At the 335-K phase transition to the metallic state, a rotation of the MEM ions, probably about the N—O axis, sets in. The entropy change due to this rotation plus that due to the added electronic degrees of freedom is in reasonable agreement with specific-heat data.

U2 - 10.1103/PhysRevB.24.5004

DO - 10.1103/PhysRevB.24.5004

M3 - Article

SN - 0163-1829

VL - 24

SP - 5004

EP - 5013

JO - Physical Review. B: Condensed Matter and Materials Physics

JF - Physical Review. B: Condensed Matter and Materials Physics

IS - 9

ER -