Specific Features of Magnetic Phase Diagram of an MnSi Helimagnet
arXiv:1411.6238 · doi:10.1134/S1063776113050087
Abstract
Magnetization curves of MnSi single crystals have been measured in a range of temperatures K and magnetic field strengths kOe for [111], [001], and [110]. Special attention has been paid to the temperature interval near K, where MnSi exhibits a transition to the state with a long-period helical magnetic structure. Some new features in the magnetic behavior of MnSi have been found. In particular, in an intermediate temperature region above the transition (28.8 K K), the curves exhibit anomalies that are not characteristic of the typical paramagnetic state. It is established that the line of the characteristic field of this anomaly is a natural extrapolation of the temperature dependence of the field of the transition from a conical phase to an induced ferromagnetic phase observed at . It is concluded that the properties of MnSi in the indicated intermediate region are related to and governed by those of the conical phase (rather than of the A phase). Based on these data, magnetic phase diagrams of MnSi for [111], [001], and [110] are plotted and compared to diagrams obtained earlier by other methods.
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