Spin superfluidity and coherent spin precession

被引:37
作者
Bunkov, Yuriy M. [1 ,2 ]
机构
[1] CNRS, Inst Neel, BP 166, F-38042 Grenoble, France
[2] UJF, F-38042 Grenoble, France
关键词
LIVED INDUCTION SIGNAL; SUPERCURRENT; HE-3-B;
D O I
10.1088/0953-8984/21/16/164201
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
The spontaneous phase coherent precession of the magnetization in superfluid He-3-B was discovered experimentally in 1984 at the Institute for Physical Problems, Moscow by Borovik-Romanov, Bunkov, Dmitriev and Mukharsky and simultaneously explained theoretically by Fomin (Institut Landau, Moscow). Its formation is a direct manifestation of spin superfluidity. The latter is the magnetic counterpart of mass superfluidity and superconductivity. It is also an example of the Bose-Einstein condensation of spin-wave excitations (magnons). The coherent spin precession opened the way for investigations of spin supercurrent magnetization transport and other related phenomena, such as spin-current Josephson effect, process of phase slippage at a critical value of spin supercurrent, spin-current vortices, non-topological solitons (analogous to Q-balls in high energy physics) etc. New measuring techniques based on coherent spin precession made the investigation of mass counterflow and mass vortices possible owing to the spin-mass interaction. New phenomena were observed: mass-spin vortices, the Goldstone mode of the mass vortex with non-axisymmetric core, superfluid density anisotropy etc. Different types of coherent spin precession were later found in superfluid He-3-A and He-3-B confined in anisotropic aerogel, in the states with counterflow and in He-3 with reduced magnetization. Finally, spin superfluidity investigations developed the basis for a modern investigation of electron spin supercurrent and spintronics.
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页数:6
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