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
N1 - Funding Information:
The neutron experiments were performed at the Materials and Life Science Experimental Facility of the J-PARC under user programs, Nos. 2012A0058 , 2013A0141 , 2014A0113 , 2014B0152 . This work was supported by JSPS KAKENHI Grant Number JP15K05154 . The magnetization measurements were carried out at the Institute for Solid State Physics (ISSP), the University of Tokyo. We acknowledge T. Masuda, M. Soda, and S. Hayashida for their assistance in taking high-energy Laue photographs in ISSP. We are grateful to N. D. Khanh and Y. Fujima for their helpful comments. K.M. is supported by the Japan Society for the Promotion of Science through the Program for Leading Graduate Schools (MERIT) and JSPS Research Fellowships for Young Scientists (JSPS KAKENHI Grant Number JP15J08412 ). The crystal structures were visualized using VESTA 3 [17] .
Publisher Copyright:
© 2017 Elsevier B.V.
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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U2 - 10.1016/j.physb.2017.09.085
DO - 10.1016/j.physb.2017.09.085
M3 - Article
AN - SCOPUS:85030454956
VL - 536
SP - 372
EP - 376
JO - Physica B: Condensed Matter
JF - Physica B: Condensed Matter
SN - 0921-4526
ER -