Elastic Anomalies in Orbital-Degenerate Frustrated Spinel CoV2O4

Tadataka Watanabe; Shogo Yamada; Rui Koborinai; Takuro Katsufuji

doi:10.1016/j.phpro.2015.12.116

Elastic Anomalies in Orbital-Degenerate Frustrated Spinel CoV₂O₄

Tadataka Watanabe^*, Shogo Yamada, Rui Koborinai, Takuro Katsufuji

^*Corresponding author for this work

School of Advanced Science and Engineering

Research output: Contribution to journal › Conference article › peer-review

Abstract

Ultrasound velocity measurements were performed on a single crystal of the orbital-degenerate frustrated spinel CoV₂O₄ in all the symmetrically-independent elastic moduli of the cubic crystal. The measurements of temperature dependence of the elastic moduli observed discontinuous elastic anomalies due to a ferrimagnetic transition at T_C = 165 K and another phase transition at T^∗ = 50 K. Additionally, the measurements observed anomalous temperature dependence of the elastic moduli, specifically, non-monotonic temperature dependence in the magnetically-ordered phase below T_C, and magnetic-field-sensitive elastic softening with decreasing temperature in the paramagnetic phase above T_C. These anomalous temperature variations below and above T_C should be driven by the coupling of lattice to magnetic excitations.

Original language	English
Pages (from-to)	898-901
Number of pages	4
Journal	Physics Procedia
Volume	75
DOIs	https://doi.org/10.1016/j.phpro.2015.12.116
Publication status	Published - 2015
Event	20th International Conference on Magnetism, ICM 2015 - Barcelona, Spain Duration: 2015 Jul 5 → 2015 Jul 10

Keywords

Frustration
Orbital order
Sound velocity
Vanadate spinel

ASJC Scopus subject areas

Physics and Astronomy(all)

Access to Document

10.1016/j.phpro.2015.12.116

Cite this

@article{bf841d805dbc40819c0a4eeca553dcd5,

title = "Elastic Anomalies in Orbital-Degenerate Frustrated Spinel CoV2O4",

abstract = "Ultrasound velocity measurements were performed on a single crystal of the orbital-degenerate frustrated spinel CoV2O4 in all the symmetrically-independent elastic moduli of the cubic crystal. The measurements of temperature dependence of the elastic moduli observed discontinuous elastic anomalies due to a ferrimagnetic transition at TC = 165 K and another phase transition at T∗ = 50 K. Additionally, the measurements observed anomalous temperature dependence of the elastic moduli, specifically, non-monotonic temperature dependence in the magnetically-ordered phase below TC, and magnetic-field-sensitive elastic softening with decreasing temperature in the paramagnetic phase above TC. These anomalous temperature variations below and above TC should be driven by the coupling of lattice to magnetic excitations.",

keywords = "Frustration, Orbital order, Sound velocity, Vanadate spinel",

author = "Tadataka Watanabe and Shogo Yamada and Rui Koborinai and Takuro Katsufuji",

note = "Funding Information: This work was partly supported by a Grant-in-Aid for Scientific Research (C) (Grant No. 25400348) from MEXT of Japan, and by Nihon University College of Science and Technology Grants-in-Aid for Project Research. Publisher Copyright: {\textcopyright} 2015 The Authors. Published by Elsevier B.V.; 20th International Conference on Magnetism, ICM 2015 ; Conference date: 05-07-2015 Through 10-07-2015",

year = "2015",

doi = "10.1016/j.phpro.2015.12.116",

language = "English",

volume = "75",

pages = "898--901",

journal = "Physics Procedia",

issn = "1875-3884",

publisher = "Elsevier BV",

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TY - JOUR

T1 - Elastic Anomalies in Orbital-Degenerate Frustrated Spinel CoV2O4

AU - Watanabe, Tadataka

AU - Yamada, Shogo

AU - Koborinai, Rui

AU - Katsufuji, Takuro

N1 - Funding Information: This work was partly supported by a Grant-in-Aid for Scientific Research (C) (Grant No. 25400348) from MEXT of Japan, and by Nihon University College of Science and Technology Grants-in-Aid for Project Research. Publisher Copyright: © 2015 The Authors. Published by Elsevier B.V.

PY - 2015

Y1 - 2015

N2 - Ultrasound velocity measurements were performed on a single crystal of the orbital-degenerate frustrated spinel CoV2O4 in all the symmetrically-independent elastic moduli of the cubic crystal. The measurements of temperature dependence of the elastic moduli observed discontinuous elastic anomalies due to a ferrimagnetic transition at TC = 165 K and another phase transition at T∗ = 50 K. Additionally, the measurements observed anomalous temperature dependence of the elastic moduli, specifically, non-monotonic temperature dependence in the magnetically-ordered phase below TC, and magnetic-field-sensitive elastic softening with decreasing temperature in the paramagnetic phase above TC. These anomalous temperature variations below and above TC should be driven by the coupling of lattice to magnetic excitations.

AB - Ultrasound velocity measurements were performed on a single crystal of the orbital-degenerate frustrated spinel CoV2O4 in all the symmetrically-independent elastic moduli of the cubic crystal. The measurements of temperature dependence of the elastic moduli observed discontinuous elastic anomalies due to a ferrimagnetic transition at TC = 165 K and another phase transition at T∗ = 50 K. Additionally, the measurements observed anomalous temperature dependence of the elastic moduli, specifically, non-monotonic temperature dependence in the magnetically-ordered phase below TC, and magnetic-field-sensitive elastic softening with decreasing temperature in the paramagnetic phase above TC. These anomalous temperature variations below and above TC should be driven by the coupling of lattice to magnetic excitations.

KW - Frustration

KW - Orbital order

KW - Sound velocity

KW - Vanadate spinel

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U2 - 10.1016/j.phpro.2015.12.116

DO - 10.1016/j.phpro.2015.12.116

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VL - 75

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JO - Physics Procedia

JF - Physics Procedia

T2 - 20th International Conference on Magnetism, ICM 2015

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