Coupling of spin and lattice modes in the S=1/2 two-dimensional antiferromagnet K 2V 3O 8 with magneto-dielectric couplings

K. Y. Choi; P. Lemmens; V. P. Gnezdilov; B. C. Sales; M. D. Lumsden

doi:10.1103/PhysRevB.85.144434

Coupling of spin and lattice modes in the S=1/2 two-dimensional antiferromagnet K ₂V ₃O ₈ with magneto-dielectric couplings

K. Y. Choi
, P. Lemmens
, V. P. Gnezdilov
, B. C. Sales
, M. D. Lumsden

Spectroscopy

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

15 Scopus citations

Abstract

Lattice dynamics and magnetic excitations are investigated to elucidate the origin of magneto-dielectric effects in the S=1/2 two-dimensional quantum spin compound K ₂V ₃O ₈. We find evidence for lattice instabilities at 110 K and 60 K as optical phonon anomalies and a soft mode at 26 cm ^-1 in A ₁ symmetry. Two-magnon excitations in B ₁ symmetry show an unconventional double-peak structure and temperature dependence. This suggests the existence of a split mode near the zone boundary caused by a mixing of spin and lattice modes.

Original language	English
Article number	144434
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	85
Issue number	14
DOIs	https://doi.org/10.1103/PhysRevB.85.144434
State	Published - Apr 30 2012

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abstract = "Lattice dynamics and magnetic excitations are investigated to elucidate the origin of magneto-dielectric effects in the S=1/2 two-dimensional quantum spin compound K 2V 3O 8. We find evidence for lattice instabilities at 110 K and 60 K as optical phonon anomalies and a soft mode at 26 cm -1 in A 1 symmetry. Two-magnon excitations in B 1 symmetry show an unconventional double-peak structure and temperature dependence. This suggests the existence of a split mode near the zone boundary caused by a mixing of spin and lattice modes.",

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AU - Choi, K. Y.

AU - Lemmens, P.

AU - Gnezdilov, V. P.

AU - Sales, B. C.

AU - Lumsden, M. D.

PY - 2012/4/30

Y1 - 2012/4/30

N2 - Lattice dynamics and magnetic excitations are investigated to elucidate the origin of magneto-dielectric effects in the S=1/2 two-dimensional quantum spin compound K 2V 3O 8. We find evidence for lattice instabilities at 110 K and 60 K as optical phonon anomalies and a soft mode at 26 cm -1 in A 1 symmetry. Two-magnon excitations in B 1 symmetry show an unconventional double-peak structure and temperature dependence. This suggests the existence of a split mode near the zone boundary caused by a mixing of spin and lattice modes.

AB - Lattice dynamics and magnetic excitations are investigated to elucidate the origin of magneto-dielectric effects in the S=1/2 two-dimensional quantum spin compound K 2V 3O 8. We find evidence for lattice instabilities at 110 K and 60 K as optical phonon anomalies and a soft mode at 26 cm -1 in A 1 symmetry. Two-magnon excitations in B 1 symmetry show an unconventional double-peak structure and temperature dependence. This suggests the existence of a split mode near the zone boundary caused by a mixing of spin and lattice modes.

UR - https://www.scopus.com/pages/publications/84860431561

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DO - 10.1103/PhysRevB.85.144434

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JO - Physical Review B - Condensed Matter and Materials Physics

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Coupling of spin and lattice modes in the S=1/2 two-dimensional antiferromagnet K ₂V ₃O ₈ with magneto-dielectric couplings

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