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Dynamic spin correlations in the frustrated cubic phase of MnV2O4

Authors
Chung, Jae-HoSong, Young-SangKim, J. -H.Suzuki, T.Katsufuji, T.Matsuda, M.Lee, S. -H.
Issue Date
23-9월-2013
Publisher
AMER PHYSICAL SOC
Citation
PHYSICAL REVIEW B, v.88, no.9
Indexed
SCIE
SCOPUS
Journal Title
PHYSICAL REVIEW B
Volume
88
Number
9
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/102135
DOI
10.1103/PhysRevB.88.094430
ISSN
1098-0121
Abstract
The ferrimagnetic spinel MnV2O4 undergoes an orbital-induced cubic-to-tetragonal distortion at T-YK = 58 K, below which noncollinear commensurate ferrimagnetic ordering occurs. Using inelastic neutron scattering, we investigated low-energy dynamics in its cubic phase above TYK. We observed two types of coexisting short-range magnetic excitations: the dispersive spin waves centered around the Brillouin-zone centers, k(0) = (0, 0, 0), and quasielastic spin fluctuations centered at incommensurate wave vectors, k(incom) = (xi,xi, 0). The coexistence of the two distinct features can be understood as a dynamic realization of the conical spiral order observed in cubic spinels such as CoCr2O4.
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