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- Choe, Wonyoung
- Laboratory for Sustainable Future
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Making and breaking covalent bonds across the magnetic transition in the giant magnetocaloric material Gd5(Si2Ge2)
- Author(s)
- Choe, Wonyoung, Pecharsky, VK, Pecharsky, AO, Gschneidner, KA, Young, VG, Miller, GJ
- Issued Date
- 2000-05
- Citation
- PHYSICAL REVIEW LETTERS, v.84, no.20, pp.4617 - 4620
- Abstract
- A temperature-dependent, single crystal x-ray diffraction study of the giant magnetocaloric material, Gd-5(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) if 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 Gd-5(SixGe1-x)(4).
- Publisher
- AMER PHYSICAL SOC
- ISSN
- 0031-9007
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