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Unusual Low-Energy Phonon Dynamics in the Negative Thermal Expansion Compound ZrW2O8

Jason N. Hancock, Chandra Turpen, Zack Schlesinger, Glen R. Kowach, and Arthur P. Ramirez
Phys. Rev. Lett. 93, 225501 – Published 22 November 2004
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Abstract

An infrared study of the phonon spectra of ZrW2O8 as a function of temperature which includes the low-energy (2–10 meV) region relevant to negative thermal expansion is reported and discussed in the context of specific heat and neutron density of state results. The prevalence of infrared active phonons at low energy and their observed temperature dependence are highly unusual and indicative of exotic low-energy lattice dynamics. Eigenvector calculations indicate a mixing of librational and translational motion within each low-frequency IR mode. The role of the underconstrained structure in establishing the nature of these modes and the relationship between the IR spectra and the large negative thermal expansion in ZrW2O8 are discussed.

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  • Received 10 August 2004

DOI:https://doi.org/10.1103/PhysRevLett.93.225501

©2004 American Physical Society

Authors & Affiliations

Jason N. Hancock, Chandra Turpen, and Zack Schlesinger

  • Physics Department, University of California–Santa Cruz, Santa Cruz, California 95064, USA

Glen R. Kowach

  • Department of Chemistry, The City College of New York, New York, New York 10031, USA

Arthur P. Ramirez

  • Bell Laboratories, Lucent Technologies, 600 Mountain Avenue, Murray Hill, New Jersey 07974, USA

See Also

Bake, Shake, and Shrink

David Lindley
Phys. Rev. Focus 14, 21 (2004)

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Issue

Vol. 93, Iss. 22 — 26 November 2004

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