Please use this identifier to cite or link to this item:
|Title:||Localized Anharmonic Rattling of Al Atoms in VAl10.1|
|Authors:||SAFARIK Douglas J.; KLIMCZUK TOMASZ; LLOBET 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|
|Type:||Articles in periodicals and books|
|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:||Nuclear Safety and Security|
Files in This Item:
There are no files associated with this item.
Items in repository are protected by copyright, with all rights reserved, unless otherwise indicated.