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VOLUME 103 (2016) | ISSUE 5 | PAGE 365
Effect of magnetic field on the intermediate phase in Mn1-xFexSi: spin-liquid vs. fluctuations scenario
DOI: 10.7868/S0370274X16050076
Abstract
We report results of the magnetic field influence on the chiral spin liquid state in Mn1-xFexSi single crystal with iron content x=0.108 in proximity of a hidden quantum critical point. The use of small angle neutron scattering data together with magnetic susceptibility measurements down to 0.4 K and precise magnetoresistance measurements in the temperature range 2-20 K in magnetic field up to 5 T allowed us to construct the magnetic phase diagram of this compound in which at low magnetic fields B<0.15 T an intermediate phase with short-range magnetic order exists in a wide temperature range 0.62<T<9.1 K. It was found that the increase of magnetic field first results in a suppression of transition into spiral phase with long-range magnetic order at very low temperatures, and then induces a transition of the intermediate phase into a spin-polarized (ferromagnetic) phase with lowering temperature. The temperature of this transition TSP increases with magnetic field logarithmically, T_{\text{SP}}\sim\log(B), and results in formation of a singular point on the magnetic phase diagram located at T \sim 8.5 K and B \sim 3.5 T, which may be either a triple or a critical point. The possible spin-liquid nature of the intermediate phase is discussed.