Making and breaking covalent bonds across the magnetic transition in the giant magnetocaloric material Gd5(Si2Ge2) |
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Authors: | Choe Pecharsky Pecharsky Gschneidner Young Miller |
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Affiliation: | Department of Chemistry, Iowa State University, Ames, Iowa 50011, USA. |
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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) A 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). |
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