Journal of the Physical Society of Japan · 2000 · 104 citations · 9 references
Natural SciencesMaterials SciencePhysicsCondensed Matter PhysicsMagnetic MaterialsSolid State PhysicsAntiferromagnetismExchange InteractionsMagnetic Properties Of SolidsMagnetism In SolidsNeutron DiffractionPhase TransitionsField-induced TransitionsFrustrated AntiferromagnetsHeisenberg AntiferromagnetHeisenberg MagnetismHeisenberg ModelIsing AntiferromagnetMagnetic Exchange InteractionsMagnetic Phase Transitions
Neutron diffraction studies on a frustrated triangular lattice antiferromagnet (TLA) CuFeO 2 have been performed under an applied magnetic field up to 14.5 T. The first-field-induced state was found to be not the commensurate 5-sublattice (↑↑↑↓↓) magnetic state but rather an incommensurate complex helical state reflecting the Heisenberg spin character of orbital singlet Fe 3+ magnetic ions. In contrast, the second-field-induced state was found to be the 5-sublattice (↑↑↑↓↓) magnetic state predicted by the two-dimensional (2D) Ising spin TLA model with competing exchange interactions up to the 3rd neighbors.
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