Abstract

AbstractThe structural properties of normal‐type spinel ZnCr2Se4 have been studied as a function of temperature by means of X‐ray diffraction using synchrotron radiation. It is found that a structural phase transition from cubic to orthorhombic symmetry occurs at 22.5 K (Tc). It is also found that, below Tc, Se ions are cooperatively displaced in a pseudo‐tetragonal (001) plane. Since the Cr3+ ion has no orbital angular momentum, a CrSe6 octahedron is not distorted by a crystal field produced by surrounding Se2– anions. It is interpreted that the pseudo‐tetragonal displacements of Se ions are induced by magnetostriction among Cr3+ ions in CrSe2 chains, in which Cr ions share two Se2– with each other along 〈110〉.

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