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Crystal structures of spin-Jahn-Teller ordered MgCr_2O_4 and ZnCr_2O_4 | | Moureen C. Kemei
; Phillip T. Barton
; Stephanie L. Moffitt
; Micheal W. Gaultois
; Joshua A. Kurzman
; Ram Seshadri
; Matthew R. Suchomel
; Young-II Kim
; | | Date: |
23 Feb 2013 | | Abstract: | Magnetic ordering in the geometrically frustrated magnetic oxide spinels
MgCr_2O_4 and ZnCr_2O_4 is accompanied by a structural change that helps
relieve the frustration. Analysis of high-resolution synchrotron X-ray
scattering reveals that the low-temperature structures are well described by a
two-phase model of tetragonal I4_1/amd and orthorhombic Fddd symmetries. The
Cr_4 tetrahedra of the pyrochlore lattice are distorted at these
low-temperatures, with the Fddd phase displaying larger distortions than the
I4_1/amd phase. The spin-Jahn-Teller distortion is approximately one order of
magnitude smaller than is observed in first-order Jahn-Teller spinels such as
NiCr_2O_4 and CuCr_2O_4. In analogy with NiCr_2O_4 and CuCr_2O_4, we further
suggest that the precise nature of magnetic ordering can itself provide a
second driving force for structural change. | | Source: | arXiv, 1302.5746 | | Services: | Forum | Review | PDF | Favorites | |
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