Pressure- and temperature-induced M3 phonon softening in ReO3

Tapan Chatterji; P. G. Freeman; M. Jimenez-RuizR. MittalS. L. Chaplot

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Pressure- and temperature-induced M3 phonon softening in ReO3

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We have investigated the temperature and pressure variation of the M3 phonon mode of ReO3 by inelastic neutron scattering on a single crystal. The energy of the M3 phonon mode decreases with decreasing temperature contrary to the normal hardening behavior. The energy of this mode also decreases with increasing pressure and tends to zero at about 3.5 kbar at T=150 K. The M3 mode softening drives the pressure-induced phase transition in ReO3. The temperature-induced softening of the M3 mode on lowering the temperature can be understood from the known negative thermal-expansion behavior and also from the fact that the highpressure phase can also be approached at ambient pressure by cooling. In order to understand the M3 phonon softening in ReO3 we have done lattice-dynamical calculations that support the qualitative arguments given above.

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《Physical review, B. Condensed matter and materials physics》 |2009年第18期|184302:1-184302:5|共5页
作者
Tapan Chatterji; P. G. Freeman; M. Jimenez-RuizR. MittalS. L. Chaplot;
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作者单位

Julich Centre for Neutron Science, Forschungszentrum Julich Outstation at Institut Laue-Langevin,BP 156, 38042 Grenoble Cedex 9, France;

Institut Laue-Langevin, BP 156, 38042 Grenoble Cedex 9, France;

Julich Centre for Neutron Science, Forschungszentrum Julich, C/O TU Munchen, Lichtenbergstrasse 1, D-85747 Garching, GermanySolid State Physics Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India;

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原文格式 PDF
正文语种英语
中图分类物理学;
关键词
Pressure; temperature; softening;

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Pressure- and temperature-induced M3 phonon softening in ReO3

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