Spin dynamics in the high-field phases of the triangular lattice antiferromagnet with XY anisotropy
Two-dimensional triangular lattice antiferromagnets (TLA) with field applied in the plane have a complex phase diagram in which fluctuations, both thermal and quantum, play a role in the stabilization of spin orders. RbFe(MoO4)2 is an excellent realization of such model with XY anisotropy. A magnetization plateau at 1/3 of the saturation is observed in this compound, as expected for TLA, but it exists on a larger field range than what is predicted. It is believed that quantum fluctuations are responsible for the extended stabilization of this phase. We propose to investigate the quantum effects on the spin dynamics in the field-induced phase of RbFe(MoO4)2. The experiment would search for possible deviations from classical spin wave theory, such as finite lifetime of the excitations and renormalization of the magnon branch.
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GAUTHIER Nicolas; BOEHM Martin; GONZALEZ DELGADO Javier; KENZELMANN Michel; PETERKEN Sam; RECIO Miguel; WAWRZYNCZAK Rafal and WHITE Jonathan. (2016). Spin dynamics in the high-field phases of the triangular lattice antiferromagnet with XY anisotropy. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-01-1511
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