Abstract
Chirality of matter can produce unique responses in optics, electricity and magnetism. In particular, magnetic crystals transmit their handedness to the magnetism via antisymmetric exchange interaction of relativistic origin, producing helical spin orders as well as their fluctuations. In this chapter, we report that chiral spin fluctuations manifest themselves in the electrical magnetochiral effect, i.e. the nonreciprocal and nonlinear response characterized by the electrical resistance depending on inner product of current and magnetic field. Prominent electrical magnetochiral signals emerge at specific temperature-magnetic field-pressure regions: in the paramagnetic phase just above the helical ordering temperature and in the partially-ordered topological spin state at low temperatures and high pressures, where thermal and quantum spin fluctuations are conspicuous in proximity of classical and quantum phase transitions, respectively.
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Yokouchi, T. (2019). Electrical Magnetochiral Effect in MnSi. In: Magneto-transport Properties of Skyrmions and Chiral Spin Structures in MnSi. Springer Theses. Springer, Singapore. https://doi.org/10.1007/978-981-32-9385-4_4
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DOI: https://doi.org/10.1007/978-981-32-9385-4_4
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