The behavior of thermal conductivity in the chaotic phase of [N(CH{sub 3}){sub 4}]{sub 2}ZnCl{sub 4} crystal

Journal Article · Thu Jul 15 00:00:00 EDT 2010 · Crystallography Reports

DOI:https://doi.org/10.1134/S106377451004019X· OSTI ID:22051181

Karpa, I V; Kunyo, I M; Semotyuk, O V; Katerynchuk, I M; Phitsych, E I ^[1]; Pankivskyi, Yu I ^[2]

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1. Lviv National University (Ukraine)
2. Ukrainian National University of Forestry (Ukraine)

A thermal investigation of the modulated structure dynamics at the transition between metastable states in the incommensurate phase of [N(CH{sub 3}){sub 4}]{sub 2}ZnCl{sub 4} crystal have been performed. It is established that the anomalous behavior of the thermal conductivity in the absence of a defect-density wave is due to the inelastic scattering of thermal phonons from critical phonons of the soft optical branch. In the presence of a defect-density wave, the anomalous increase in thermal conductivity is caused by the existence of a chaotic phase and is related to the contribution that soft optical phonons make to the heat transfer due to the increase in their group velocity.

• OSTI ID: 22051181
• Journal Information: Crystallography Reports, Vol. 55, Issue 4; Other Information: Copyright (c) 2010 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1063-7745
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CRYSTAL DEFECTS
CRYSTALS
HEAT TRANSFER
INELASTIC SCATTERING
METASTABLE STATES
PHONONS
THERMAL CONDUCTIVITY
ZINC CHLORIDES