Abstract
The intermetallic compounds with the B20 type of structure have been received continual attention and studied in detail in the past decades [1–3]. This is because their electrical and magnetic properties show a variety, depending on the constituent elements. Among them, MnSi has been studied most extensively and revealed to be a helical magnet whose Néel temperature TN is 29 K [4]. According to the neutron diffraction experiments performed by ISHIKAWA et al., this helical spin density wave (HSDW) has the peculiar properties as follows [4,5]: (i) The period is very long (180 Å). (ii) The equilibrium direction of the wave vector \(\vec{Q}\) is <111>. When an external magnetic field is applied, the direction of \(\vec{Q}\) follows that of the magnetic field, (iii) The period does not depend on the direction of \(\vec{Q}\), but depends weakly on temperature. (iv) The HSDW is changed into an induced ferromagnetic state (IFMS) by a weak external magnetic field (6.2 K0e). This means that the energy difference between the HSDW and the ferromagnetic state (FMS) is much small. The IFMS is supposed to be a typical example of itinerant weak ferromagnetism on the basis of the following experimental facts: (i) The induced ferromagnetic moment 0.4 µB/Mn is much less than 1.4 µB/Mn obtained by using the Curie-Weiss constant in the paramagnetic phase [2,6]. (ii) The magnetization curve does not saturate even at 150 K0e [7]. (iii) The spin-lattice relaxation time Tl of 55Mn in MnSi is independent of temperature at temperatures much higher than TN[8,9].
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Nakanishi, O., Yanase, A., Kataoka, M. (1981). Electronic Band Structure and Helical Spin Density Wave of MnSi. In: Moriya, T. (eds) Electron Correlation and Magnetism in Narrow-Band Systems. Springer Series in Solid-State Sciences, vol 29. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-81639-0_15
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DOI: https://doi.org/10.1007/978-3-642-81639-0_15
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