Ames Laboratory, Chemistry, Materials Science and Engineering
Journal or Book Title
Physical Review Letters
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.
American Physical Society
Choe, Wonyoung; Pecharsky, Vitalij K.; Pecharsky, Alexandra O.; Gschneidner, Karl A. Jr.; Young, V.G.; and Miller, Gordon J., "Making and Breaking Covalent Bonds across the Magnetic Transition in the Giant Magnetocaloric Material Gd5(Si2Ge2)" (2000). Chemistry Publications. 833.