Elastic instabilities in an antiferromagnetically ordered phase of the orbitally frustrated spinel GeCo2O4

Tadataka Watanabe, Shigeo Hara, Shin Ichi Ikeda, Keisuke Tomiyasu

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

Ultrasound velocity measurements of the orbitally frustrated spinel GeCo2O4 reveal unique elastic anomalies within the antiferromagnetic phase. Temperature dependence of shear moduli exhibits a minimum within the antiferromagnetic phase, suggesting the coupling of shear acoustic phonons to molecular spin-orbit excitations. Magnetic-field dependence of elastic moduli exhibits diplike anomalies, being interpreted as magnetic-field-induced metamagnetic and structural transitions. These elastic anomalies suggest that the survival of geometrical frustration, and the interplay of spin, orbital, and lattice degrees of freedom evoke a set of phenomena in the antiferromagnetic phase.

Original languageEnglish
Article number020409
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume84
Issue number2
DOIs
Publication statusPublished - 2011 Jul 20

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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