Spin-gap observation in the triangular lattice antiferromagnet InMnO3 by high-field ESR

InMnO3 can be considered a model substance of the S=2 triangular lattice antiferromagnet from the crystal structure. As the magnetic susceptibility with a maximum around 15 K does not show a long-range order in spite of the large negative Weiss temperature of -430 K, spin frustration is expected to...

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Bibliographic Details
Published inJournal of physics. Conference series Vol. 200; no. 2; p. 022041
Main Authors Ohta, H, Matsumi, N, Okubo, S, Fujisawa, M, Sakurai, T, Kikuchi, H, Furukawa, K, Nakamura, T
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 01.01.2010
Subjects
Antiferromagnetism
Crystal lattices
Crystal structure
Frequency ranges
Frustration
Long range order
Low temperature
Magnetic permeability
Physics
Temperature dependence
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Summary:InMnO3 can be considered a model substance of the S=2 triangular lattice antiferromagnet from the crystal structure. As the magnetic susceptibility with a maximum around 15 K does not show a long-range order in spite of the large negative Weiss temperature of -430 K, spin frustration is expected to occur. We have performed the high-frequency high-field ESR of a powder sample InMnO3 in the frequency range of 70 to 360 GHz using the pulsed magnetic field up to 16 T together with the conventional X and Q-bamd ESR. The temperature dependence shows the g-shift and the broadening of the linewidth at low temperature, suggesting the development of spin correlation. Moreover, the frequency dependence measurement at 2.0 K suggests the existence of a spin gap. The spin gap is estimated to be about 26.5 GHz (1.2 K). The origin of the spin gap will be discussed in connection with the spin frustration in the system.
ISSN:1742-6596
1742-6588
1742-6596
DOI:10.1088/1742-6596/200/2/022041