Anisotropy Stabilized Magnetic Phases of the Triangular Antiferromagnet RbFe(MoO4)2

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Resumo

The magnetic H–T phase diagram of a quasi-two-dimensional easy plane antiferromagnet RbFe(MoO4)2 (S = 5/2) with an equilateral triangular lattice structure is studied with 87Rb NMR technique for field directed along hard axis C3. The studies confirm the two step transition from the low field umbrella-like incommensurate magnetic phase to the paramagnetic state observed recently (H. Mitamura et al., J. Magn. Magn. Mater. 400, 70 (2016)). The transitions were identified as a lambda anomaly in the spin-lattice relaxation rate and a step increase of magnetic susceptibility at intermediate transition. The 87Rb NMR study precludes the possibility of either V or fan spin textures in the new high field phase. The additional transition is presumably associated with loss of inter plane magnetic order before the transition to paramagnetic state of individual triangular planes.

Sobre autores

Yu. Sakhratov

National High Magnetic Field Laboratory;
Kazan State Power Engineering University

Email: svistov@kapitza.ras.ru
32310, Tallahassee, Florida, USA; 420066, Kazan, Russia

L. Svistov

Kapitza Institute for Physical Problems, Russian Academy of Sciences

Email: svistov@kapitza.ras.ru
119334, Moscow, Russia

A. Reyes

National High Magnetic Field Laboratory

Autor responsável pela correspondência
Email: svistov@kapitza.ras.ru
32310, Tallahassee, Florida, USA

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