Direct observation of the nonaxisymmetric vortex in superfluid 3He-B.
Direct observation of the nonaxisymmetric vortex in superfluid 3He-B.
复制标题
超流体 3He-B 中非轴对称涡旋的直接观察。
DOI：
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发表时间：
1991
影响因子：
8.6
通讯作者：
G. Volovik
中科院分区：
文献类型：
--
作者：
Y. Kondo;J. S. Korhonen;M. Krusius;V. Dmitriev;Y. Mukharsky;E. Sonin;G. Volovik
We present experimental proof that in rotating {sup 3}He-{ital B} the vortex-core transition temperature {ital T}{sub {ital V}} separates axisymmetric vortices above {ital T}{sub {ital V}} from vortices with spontaneously broken axial symmetry below {ital T}{sub {ital V}}. The nonaxisymmetry is observed in the presence of coherent spin precession as a new soft Goldstone mode, manifested as oscillations and spiral twisting of the core anisotropy axis. These are driven by the precessing spin via spin-orbit coupling and lead to magnetic relaxation from viscous losses, which depend on vortex pinning.
We present experimental proof that in rotating {sup 3}He-{ital B} the vortex-core transition temperature {ital T}{sub {ital V}} separates axisymmetric vortices above {ital T}{sub {ital V}} from vortices with spontaneously broken axial symmetry below {ital T}{sub {ital V}}. The nonaxisymmetry is observed in the presence of coherent spin precession as a new soft Goldstone mode, manifested as oscillations and spiral twisting of the core anisotropy axis. These are driven by the precessing spin via spin-orbit coupling and lead to magnetic relaxation from viscous losses, which depend on vortex pinning.