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Multiple lattice instabilities resolved by magnetic-field and disorder sensitivities in MgV2O4

Tadataka Watanabe, Takashi Ishikawa, Shigeo Hara, A. T. M. Nazmul Islam, Elisa M. Wheeler, and Bella Lake
Phys. Rev. B 90, 100407(R) – Published 19 September 2014

Abstract

Ultrasound velocity measurements of the orbitally degenerate frustrated spinel MgV2O4 are performed in a high-purity single crystal which exhibits successive structural and antiferromagnetic phase transitions, and in the disorder-introduced single crystal which exhibits spin-glass-like behavior. The measurements reveal that two types of unusual temperature dependence of the elastic moduli coexist in the cubic paramagnetic phase, which are resolved by magnetic-field and disorder sensitivities: huge Curie-type softening with decreasing temperature (convex temperature dependence), and concave temperature dependence with a characteristic minimum. These elastic anomalies suggest the coupling of the lattice to coexisting orbital fluctuations and spin-cluster excitations.

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  • Received 12 May 2014
  • Revised 24 August 2014

DOI:https://doi.org/10.1103/PhysRevB.90.100407

©2014 American Physical Society

Authors & Affiliations

Tadataka Watanabe1, Takashi Ishikawa1, Shigeo Hara2, A. T. M. Nazmul Islam3, Elisa M. Wheeler3, and Bella Lake3

  • 1Department of Physics, College of Science and Technology (CST), Nihon University, Chiyoda, Tokyo 101-8308, Japan
  • 2Department of Physics, Chuo University, Bunkyo, Tokyo 101-8324, Japan
  • 3Helmholtz-Zentrum Berlin für Materialien und Energie, Hahn-Meitner-Platz 1, D-14109 Berlin, Germany

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Issue

Vol. 90, Iss. 10 — 1 September 2014

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