Diluted orbital degeneracy and large orthorhombic distortions in ferrimagnetic spinel CuxMn3-x O4

Kee Hwan Lee, Hun Chang, In Yong Hwang, Jaiho Chung, Hyun Wook Kang, Su Jae Kim, Seongsu Lee

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

We report large orthorhombic distortions in the ferrimagnetic tetragonal (c>a) spinel CuxMn3-xO4 stabilized by a few percent of Cu doping. The orthorhombic strains of the ferrimagnetic phases increased linearly to the doping and reached up to ε≈8.2×10-3 for x=0.19, which is three times larger than the saturated value under external magnetic fields. For high doping (x≳0.17), the distortions first appeared in the paramagnetic phases and underwent further enhancement simultaneously with the onset of the noncollinear ferrimagnetic ordering. We present the rich magnetostructural phase diagram of CuxMn3-xO4, and argue that the diluted t2 orbital degeneracy of Cu2+ under tetrahedral crystal field breaks the global symmetry and triggers the orthorhombic instability inherent in Mn3O4.

Original languageEnglish
Article number064404
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume91
Issue number6
DOIs
Publication statusPublished - 2015 Feb 3

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spinel
Doping (additives)
orbitals
Crystal symmetry
Phase diagrams
crystal field theory
actuators
phase diagrams
Magnetic fields
Crystals
augmentation
symmetry
magnetic fields
spinell
manganese oxide

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Diluted orbital degeneracy and large orthorhombic distortions in ferrimagnetic spinel CuxMn3-x O4. / Lee, Kee Hwan; Chang, Hun; Hwang, In Yong; Chung, Jaiho; Kang, Hyun Wook; Kim, Su Jae; Lee, Seongsu.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 91, No. 6, 064404, 03.02.2015.

Research output: Contribution to journalArticle

Lee, Kee Hwan ; Chang, Hun ; Hwang, In Yong ; Chung, Jaiho ; Kang, Hyun Wook ; Kim, Su Jae ; Lee, Seongsu. / Diluted orbital degeneracy and large orthorhombic distortions in ferrimagnetic spinel CuxMn3-x O4. In: Physical Review B - Condensed Matter and Materials Physics. 2015 ; Vol. 91, No. 6.
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AU - Kim, Su Jae

AU - Lee, Seongsu

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