期刊
PHYSICAL REVIEW LETTERS
卷 84, 期 20, 页码 4617-4620出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.84.4617
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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).
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