Making and breaking covalent bonds across the magnetic transition in the giant magnetocaloric material Gd5(Si2Ge2)

W. Choe, V. K. Pecharsky, A. O. Pecharsky, K. A. Gschneidner, V. G. Young, G. J. Miller

Research output: Contribution to journalArticlepeer-review

349 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)4617-4620
Number of pages4
JournalPhysical review letters
Volume84
Issue number20
DOIs
StatePublished - 2000

Fingerprint Dive into the research topics of 'Making and breaking covalent bonds across the magnetic transition in the giant magnetocaloric material Gd<sub>5</sub>(Si<sub>2</sub>Ge<sub>2</sub>)'. Together they form a unique fingerprint.

Cite this