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

IMR - Materials Design Division

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

2 Citations (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

Keywords

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

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10.1016/j.physb.2017.09.085

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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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year = "2018",

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doi = "10.1016/j.physb.2017.09.085",

language = "English",

volume = "536",

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journal = "Physica B: Condensed Matter",

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TY - JOUR

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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SP - 372

EP - 376

JO - Physica B: Condensed Matter

JF - Physica B: Condensed Matter

ER -

Magnetic excitations in the orbital disordered phase of MnV₂O₄

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Keywords

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