Correlation between the structural and antiferromagnetic phase transitions in ZnCr2Se4

M. Hidaka, N. Tokiwa, M. Fujii, S. Watanabe, J. Akimitsu

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20 Citations (Scopus)

Abstract

Structural properties of normal-type spinel ZnCr2Se4 have been studied as a function of temperature by means of neutron diffraction. It is found that the structural phase transition (TC) from a cubic to orthorhombic symmetry simultaneously occurs at the antiferromagnetic phase transition temperature (TN ∼ 21 K), where the cubic and orthorhombic symmetry is 7Oh-Fd3m and 24D2h-Fddd, respectively. The structural phase transition is mainly characterized by the cooperative displacements of Se2- ions, which are induced by a magnetostriction resulting from the magnetic interaction of Cr3+ ions in CrSe4 chains along [110]. The antiferromagnetic magnetic structure below TN is made by a spiral magnetic coupling between the ferromagnetic CrSe4 chains around crystallographic screw axes, which are parallel to an orthorhombic C axis. The spiral long-range order of the spins of Cr3- is incommensurate and its periodicity of q along a reciprocal lattice axis C* shows temperature dependence from about 0.47 (2.5 K) to 0.43 (18 K). The spiral periodicity of the spin order along the C axis shows a first order transition at about 21 K.

Original languageEnglish
Pages (from-to)9-18
Number of pages10
JournalPhysica Status Solidi (B) Basic Research
Volume236
Issue number1
DOIs
Publication statusPublished - Mar 2003

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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