Campus Units

Ames Laboratory, Chemistry, Materials Science and Engineering

Document Type

Article

Publication Version

Published Version

Publication Date

2000

Journal or Book Title

Physical Review Letters

Volume

84

Issue

20

First Page

1

Last Page

4

DOI

10.1103/PhysRevLett.84.4617

Abstract

A temperature-dependent, single crystal x-ray diffraction study of the giant magnetocaloric material, Gd5(Si2Ge2), across its Curie temperature (276 K) reveals that the simultaneous orthorhombic to monoclinic transition occurs by a shear mechanism in which the (Si,Ge)−(Si,Ge) dimers that are richer in Ge increase their distances by 0.859(3) Å and lead to twinning. The structural transition changes the electronic structure, and provides an atomic-level model for the change in magnetic behavior with temperature in the Gd5(SixGe1−x)4.

Comments

This article is from Physical Review Letters 84 (2000): 1, doi:10.1103/PhysRevLett.84.4617. Posted with permission.

Copyright Owner

American Physical Society

Language

en

File Format

application/pdf

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