Dzyaloshinskii-Moriya interaction and spin reorientation transition in the frustrated kagome lattice antiferromagnet

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書誌事項

公開日
2011-06-09
権利情報
  • http://link.aps.org/licenses/aps-default-license
  • http://link.aps.org/licenses/aps-default-accepted-manuscript-license
DOI
  • 10.1103/physrevb.83.214406
  • 10.48550/arxiv.1102.0185
公開者
American Physical Society (APS)

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説明

Magnetization, specific heat, and neutron scattering measurements were performed to study a magnetic transition in jarosite, a spin-5/2 kagome lattice antiferromagnet. When a magnetic field is applied perpendicular to the kagome plane, magnetizations in the ordered state show a sudden increase at a critical field H_c, indicative of the transition from antiferromagnetic to ferromagnetic states. This sudden increase arises as the spins on alternate kagome planes rotate 180 degrees to ferromagnetically align the canted moments along the field direction. The canted moment on a single kagome plane is a result of the Dzyaloshinskii-Moriya interaction. For H < H_c, the weak ferromagnetic interlayer coupling forces the spins to align in such an arrangement that the canted components on any two adjacent layers are equal and opposite, yielding a zero net magnetic moment. For H > H_c, the Zeeman energy overcomes the interlayer coupling causing the spins on the alternate layers to rotate, aligning the canted moments along the field direction. Neutron scattering measurements provide the first direct evidence of this 180-degree spin rotation at the transition.

13 pages, 15 figures

収録刊行物

  • Physical Review B

    Physical Review B 83 (21), 2011-06-09

    American Physical Society (APS)

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