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Article Dans Une Revue Physical Review Letters Année : 2017

Order by Quenched Disorder in the Model Triangular Antiferromagnet RbFe ( MoO 4 ) 2

Résumé

We observe a disappearance of the 1/3 magnetization plateau and a striking change of the magnetic configuration under a moderate doping of the model triangular antiferromagnet RbFe(MoO4)(2). The reason is an effective lifting of degeneracy of mean-field ground states by a random potential of impurities, which compensates, in the low-temperature limit, the fluctuation contribution to free energy. These results provide a direct experimental confirmation of the fluctuation origin of the ground state in a real frustrated system. The change of the ground state to a least collinear configuration reveals an effective positive biquadratic exchange provided by the structural disorder. On heating, doped samples regain the structure of a pure compound, thus allowing for an investigation of the remarkable competition between thermal and structural disorder.

Dates et versions

hal-02095579 , version 1 (10-04-2019)

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Citer

A. i. Smirnov, T. a. Soldatov, O. a. Petrenko, A. Takata, T. Kida, et al.. Order by Quenched Disorder in the Model Triangular Antiferromagnet RbFe ( MoO 4 ) 2. Physical Review Letters, 2017, 119 (4), pp.047204. ⟨10.1103/PhysRevLett.119.047204⟩. ⟨hal-02095579⟩
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