Title: Localized Anharmonic Rattling of Al Atoms in VAl10.1
Authors: SAFARIK Douglas J.KLIMCZUK TOMASZLLOBET A.BYLER D. D.LASHLEY J. C.O'BRIEN J. R.DILLEY N. R.
Citation: PHYSICAL REVIEW B vol. 85 no. 1 p. 014103 (1-14)
Publisher: AMER PHYSICAL SOC
Publication Year: 2012
JRC N°: JRC67217
ISSN: 1098-0121
URI: http://prb.aps.org/abstract/PRB/v85/i1/e014103
http://publications.jrc.ec.europa.eu/repository/handle/JRC67217
DOI: 10.1103/PhysRevB.85.014103
Type: Articles in Journals
Abstract: We have used a suite of diffraction, thermodynamic, and transport measurements to study the localized rattling of Al guest atoms in VAl10:1. The mean square displacement of the rattling atom shows a concave down temperature dependence. This is characteristic of an anharmonic vibration, the frequency of which increases with amplitude, akin to a particle-in-a-box. We find that the rattling is best described in terms of a sixth-order interatomic potential, with negligible contributions from harmonic and quartic terms. The ratter has a characteristic temperature of Θ RM = 21 K and couples strongly to both the acoustic phonons and conduction electrons. The coupling to the phonons is evident from the large value of the Grüneisen parameter, which increases with decreasing temperature to Г~ 43 at 5 K. Below 6 K the electrical resistivity varies as T3, which can be explained in terms of electron scattering from damped sixth-order vibrations. VAl10:1 is a superconductor below Tc = 1.53 K, with an upper critical field of ~1 kG.
JRC Institute:Institute for Transuranium Elements

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