Magnetic excitations in the orbital disordered phase of MnV2O4

Keisuke Matsuura; Hajime Sagayama; Amane Uehara; Yoichi Nii; Ryoichi Kajimoto; Kazuya Kamazawa; Kazuhiko Ikeuchi; Sungdae Ji; Nobuyuki Abe; Taka hisa Arima

doi:10.1016/j.physb.2017.09.085

Magnetic excitations in the orbital disordered phase of MnV₂O₄

Keisuke Matsuura, Hajime Sagayama, Amane Uehara, Yoichi Nii, Ryoichi Kajimoto, Kazuya Kamazawa, Kazuhiko Ikeuchi, Sungdae Ji, Nobuyuki Abe, Taka hisa Arima

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

Abstract

We have investigated the temperature dependence of magnetic dynamics in a spinel-type vanadium oxide MnV₂O₄ by inelastic neutron scattering. The scattering intensity of excitation around 20 meV disappears in the collinear intermediate-temperature cubic-ferrimagnetic phase, which reveals that this excitation should be peculiar to the orbital ordered phase. We have found a weakly dispersive mode emergent from a non-integer wavevector (1.4,1.4,0) at 56 K, which lies in the cubic-ferrimagnetic phase between non-coplanar ferrimagnetic and paramagnetic phases. This indicates that the probable presence of an incommensurate instability in the simple collinear structure.

Original language	English
Pages (from-to)	372-376
Number of pages	5
Journal	Physica B: Condensed Matter
Volume	536
DOIs	https://doi.org/10.1016/j.physb.2017.09.085
Publication status	Published - 2018 May 1
Externally published	Yes

Keywords

Inelastic neutron scattering
MnVO
Orbital degree of freedom
Spin wave
Spinel oxide

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering

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Magnetic excitations in the orbital disordered phase of MnV₂O₄ . / Matsuura, Keisuke; Sagayama, Hajime; Uehara, Amane; Nii, Yoichi; Kajimoto, Ryoichi; Kamazawa, Kazuya; Ikeuchi, Kazuhiko; Ji, Sungdae; Abe, Nobuyuki; Arima, Taka hisa.

In: Physica B: Condensed Matter, Vol. 536, 01.05.2018, p. 372-376.

Research output: Contribution to journal › Article › peer-review

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title = "Magnetic excitations in the orbital disordered phase of MnV2O4 ",

abstract = "We have investigated the temperature dependence of magnetic dynamics in a spinel-type vanadium oxide MnV2O4 by inelastic neutron scattering. The scattering intensity of excitation around 20 meV disappears in the collinear intermediate-temperature cubic-ferrimagnetic phase, which reveals that this excitation should be peculiar to the orbital ordered phase. We have found a weakly dispersive mode emergent from a non-integer wavevector (1.4,1.4,0) at 56 K, which lies in the cubic-ferrimagnetic phase between non-coplanar ferrimagnetic and paramagnetic phases. This indicates that the probable presence of an incommensurate instability in the simple collinear structure.",

keywords = "Inelastic neutron scattering, MnVO, Orbital degree of freedom, Spin wave, Spinel oxide",

author = "Keisuke Matsuura and Hajime Sagayama and Amane Uehara and Yoichi Nii and Ryoichi Kajimoto and Kazuya Kamazawa and Kazuhiko Ikeuchi and Sungdae Ji and Nobuyuki Abe and Arima, {Taka hisa}",

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T1 - Magnetic excitations in the orbital disordered phase of MnV2O4

AU - Matsuura, Keisuke

AU - Sagayama, Hajime

AU - Uehara, Amane

AU - Nii, Yoichi

AU - Kajimoto, Ryoichi

AU - Kamazawa, Kazuya

AU - Ikeuchi, Kazuhiko

AU - Ji, Sungdae

AU - Abe, Nobuyuki

AU - Arima, Taka hisa

PY - 2018/5/1

Y1 - 2018/5/1

N2 - We have investigated the temperature dependence of magnetic dynamics in a spinel-type vanadium oxide MnV2O4 by inelastic neutron scattering. The scattering intensity of excitation around 20 meV disappears in the collinear intermediate-temperature cubic-ferrimagnetic phase, which reveals that this excitation should be peculiar to the orbital ordered phase. We have found a weakly dispersive mode emergent from a non-integer wavevector (1.4,1.4,0) at 56 K, which lies in the cubic-ferrimagnetic phase between non-coplanar ferrimagnetic and paramagnetic phases. This indicates that the probable presence of an incommensurate instability in the simple collinear structure.

AB - We have investigated the temperature dependence of magnetic dynamics in a spinel-type vanadium oxide MnV2O4 by inelastic neutron scattering. The scattering intensity of excitation around 20 meV disappears in the collinear intermediate-temperature cubic-ferrimagnetic phase, which reveals that this excitation should be peculiar to the orbital ordered phase. We have found a weakly dispersive mode emergent from a non-integer wavevector (1.4,1.4,0) at 56 K, which lies in the cubic-ferrimagnetic phase between non-coplanar ferrimagnetic and paramagnetic phases. This indicates that the probable presence of an incommensurate instability in the simple collinear structure.

KW - Inelastic neutron scattering

KW - MnVO

KW - Orbital degree of freedom

KW - Spin wave

KW - Spinel oxide

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