Specific heat of TSeF-TCNQ

D. K. Powell; T. Miebach; S. L. Cheng; L. K. Montgomery; J. W. Brill

doi:10.1016/S0038-1098(97)00275-5

Specific heat of TSeF-TCNQ

D. K. Powell, T. Miebach, S. L. Cheng, L. K. Montgomery, J. W. Brill

Physics And Astronomy

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5 Scopus citations

Abstract

We have measured the specific heat of single crystals of TSeF-TCNQ. Anomalies are observed at T_a = 28 K and T_b = 33 K, indicating that there are two phase transitions, presumably reflecting the separate condensation of the charge-density-wave on the TSeF and TCNQ conducting chains. The total increase of the specific heat on cooling through both transitions is larger than the value estimated from mean-field theory, as expected for transitions in a quasi-one dimensional material, but, because of the proximity of the two transitions, it is not possible to unambiguously determine the specific heat baseline and hence the magnitude of the specific heat step. A sharp peak in specific heat is also observed at T_a; if the entropy contained in this peak is to be associated with locking of the charge-density-wave phases on the two conducting chains, its large size implies a surprisingly small phase coherent volume.

Original language	English
Pages (from-to)	95-99
Number of pages	5
Journal	Solid State Communications
Volume	104
Issue number	2
DOIs	https://doi.org/10.1016/S0038-1098(97)00275-5
State	Published - Oct 1997

Keywords

A. organic crystals
D. heat capacity
Phase transitions

ASJC Scopus subject areas

General Chemistry
Condensed Matter Physics
Materials Chemistry

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10.1016/S0038-1098(97)00275-5

Cite this

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title = "Specific heat of TSeF-TCNQ",

abstract = "We have measured the specific heat of single crystals of TSeF-TCNQ. Anomalies are observed at Ta = 28 K and Tb = 33 K, indicating that there are two phase transitions, presumably reflecting the separate condensation of the charge-density-wave on the TSeF and TCNQ conducting chains. The total increase of the specific heat on cooling through both transitions is larger than the value estimated from mean-field theory, as expected for transitions in a quasi-one dimensional material, but, because of the proximity of the two transitions, it is not possible to unambiguously determine the specific heat baseline and hence the magnitude of the specific heat step. A sharp peak in specific heat is also observed at Ta; if the entropy contained in this peak is to be associated with locking of the charge-density-wave phases on the two conducting chains, its large size implies a surprisingly small phase coherent volume.",

keywords = "A. organic crystals, D. heat capacity, Phase transitions",

author = "Powell, {D. K.} and T. Miebach and Cheng, {S. L.} and Montgomery, {L. K.} and Brill, {J. W.}",

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language = "English",

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pages = "95--99",

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TY - JOUR

T1 - Specific heat of TSeF-TCNQ

AU - Powell, D. K.

AU - Miebach, T.

AU - Cheng, S. L.

AU - Montgomery, L. K.

AU - Brill, J. W.

PY - 1997/10

Y1 - 1997/10

N2 - We have measured the specific heat of single crystals of TSeF-TCNQ. Anomalies are observed at Ta = 28 K and Tb = 33 K, indicating that there are two phase transitions, presumably reflecting the separate condensation of the charge-density-wave on the TSeF and TCNQ conducting chains. The total increase of the specific heat on cooling through both transitions is larger than the value estimated from mean-field theory, as expected for transitions in a quasi-one dimensional material, but, because of the proximity of the two transitions, it is not possible to unambiguously determine the specific heat baseline and hence the magnitude of the specific heat step. A sharp peak in specific heat is also observed at Ta; if the entropy contained in this peak is to be associated with locking of the charge-density-wave phases on the two conducting chains, its large size implies a surprisingly small phase coherent volume.

AB - We have measured the specific heat of single crystals of TSeF-TCNQ. Anomalies are observed at Ta = 28 K and Tb = 33 K, indicating that there are two phase transitions, presumably reflecting the separate condensation of the charge-density-wave on the TSeF and TCNQ conducting chains. The total increase of the specific heat on cooling through both transitions is larger than the value estimated from mean-field theory, as expected for transitions in a quasi-one dimensional material, but, because of the proximity of the two transitions, it is not possible to unambiguously determine the specific heat baseline and hence the magnitude of the specific heat step. A sharp peak in specific heat is also observed at Ta; if the entropy contained in this peak is to be associated with locking of the charge-density-wave phases on the two conducting chains, its large size implies a surprisingly small phase coherent volume.

KW - A. organic crystals

KW - D. heat capacity

KW - Phase transitions

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DO - 10.1016/S0038-1098(97)00275-5

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VL - 104

SP - 95

EP - 99

JO - Solid State Communications

JF - Solid State Communications

IS - 2

ER -

Specific heat of TSeF-TCNQ

Abstract

Keywords

ASJC Scopus subject areas

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