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Article
Making and Breaking Covalent Bonds across the Magnetic Transition in the Giant Magnetocaloric Material Gd5(Si2Ge2)
Physical Review Letters
  • Wonyoung Choe, Iowa State University
  • Vitalij K. Pecharsky, Iowa State University
  • Alexandra O. Pecharsky, Iowa State University
  • Karl A. Gschneidner, Jr., Iowa State University
  • V.G. Young, University of Minnesota
  • Gordon J. Miller, Iowa State University
Document Type
Article
Publication Version
Published Version
Publication Date
1-1-2000
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
Citation Information
Wonyoung Choe, Vitalij K. Pecharsky, Alexandra O. Pecharsky, Karl A. Gschneidner, et al.. "Making and Breaking Covalent Bonds across the Magnetic Transition in the Giant Magnetocaloric Material Gd5(Si2Ge2)" Physical Review Letters Vol. 84 Iss. 20 (2000) p. 1 - 4
Available at: http://works.bepress.com/gordon-miller/64/