Specific features of magnetic phase diagram of an MnSi helimagnet
- Russian Academy of Sciences, Vereshchagin Institute for High Pressure Physics (Russian Federation)
Magnetization curves of MnSi single crystals have been measured in a range of temperatures T = 5.5-35 K and magnetic field strengths H {<=} 11 kOe for H Parallel-To [1 1 1], [0 0 1], and [1 1 0]. Special attention has been paid to the temperature interval near T{sub N} = 28.8 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 = T{sub N} {<=} T < 31.5 K), the dM(H)/dH curves exhibit anomalies that are not characteristic of the typical paramagnetic state. It is established that the line of the characteristic field H*(T) 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 T < T{sub N}. 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 H Parallel-To [1 1 1], [0 0 1], and [1 1 0] are plotted and compared to diagrams obtained earlier by other methods.
- OSTI ID:
- 22126485
- Journal Information:
- Journal of Experimental and Theoretical Physics, Vol. 116, Issue 5; Other Information: Copyright (c) 2013 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1063-7761
- Country of Publication:
- United States
- Language:
- English
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