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Title: Magnetic soft modes in the distorted triangular antiferromagnet α-CaCr2O4
Authors: Toth, S
Lake, B
Hradil, K
Guidi, T
Rule, KC
Stone, MB
Islam, ATMN
Keywords: Spin
Neutron reactions
Issue Date: 19-Sep-2012
Publisher: American Physical Society
Citation: Toth, S., Lake, B., Hradil, K., Guidi, T., Rule, K. C., Stone, M. B., & Islam, A. T. M. N. (2012). Magnetic soft modes in the distorted triangular antiferromagnet α-CaCr2O4. Physical Review Letters, 109(12), Article Number 127203. doi:10.1103/PhysRevLett.109.127203
Abstract: In this Letter, we explore the phase diagram and excitations of a distorted triangular lattice anti-ferromagnet. The unique two-dimensional distortion considered here is very different from the "isosceles''- type distortion that has been extensively investigated. We show that it is able to stabilize a 120 degrees spin structure for a large range of exchange interaction values, while new structures are found for extreme distortions. A physical realization of this model is alpha-CaCr2O4, which has a 120 degrees structure but lies very close to the phase boundary. This is verified by inelastic neutron scattering which reveals unusual rotonlike minima at reciprocal space points different from those corresponding to the magnetic order. © 2012, American Physical Society.
Gov't Doc #: 4589
ISSN: 0031-9007
Appears in Collections:Journal Articles

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