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STABILIZATION OF THE COLLINEAR PLATEAU PHASE BY THERMAL FLUCTUATIONS IN THE DILUTED TRIANGULAR LATTICE ANTIFERROMAGNET RbKFe(MoO)

Issue number 3(9) from 15.09.2025

The triangular lattice antiferromagnet RbFe(MoO) orders antiferromagnetically in a planar 120°-structure below ≈ 4 K. A striking feature of RbFe(MoO) magnetic phase diagram is the presence of collinear «1/3-plateau» magnetic phase, which is stabilized by thermal and quantum fluctuations at magnetic fields in the vicinity of 1/3 of a saturation field. Quenched disorder caused by impurities is predicted to act against the effect of fluctuations and to suppress collinear plateau phase [V. S. Maryasin and M. E. Zhitomirsky, Phys. Rev. Lett. 111, 247201 (2013)]. Balance between thermal and quantum fluctuations and «static» impurity-induced disorder is temperature-sensitive, which allows thermal fluctuations to take over the effect of static disorder and leads to the restoration of the fluctuation-stabilized «1/3-plateau» phase on heating. Here we present experimental results directly confirming this prediction and demonstrating re-establishment of the plateau-like phase in the diluted RbKFe(MoO) sample at moderate dilution level =0.15 on increasing the temperature.

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