ISSP - The institute for Solid State Physics

Seminar
Font Size: (S) / (M) / (L)
[ISSP Colloquiums]
Spin Superfluidity and Coherent Spin Precession (London Prize Lecture)
Title : Spin Superfluidity and Coherent Spin Precession (London Prize Lecture)
Date :
Time :
2008/4/25(Fri)
1:30 PM -  
Place : Lecture Room (A632), 6th Floor, ISSP   
Lecturer : Prof. Yuriy M. Bunkov
Affiliation : MCBT, Institut Neel, CNRS/UJF, 38042, Grenoble, France
Summary : The spontaneous phase coherent precession of the magnetization in superfluid 3He-B was discovered in 1984 in the Kapitza Institute, Moscow {A. Borovik-Romanov, Yu. Bunkov, V. Dmitriev, and Yu. Mukharskiy, JETP~Lett.~ 40, 1033 (1984).} and was explained theoretically as a direct manifestation of spin supercurrent {I. Fomin, JETP~Lett.~ 40, 1037 (1984).}. The latter is a magnetic counterpart of mass superfludity and superconductivity. It is also an example of the Bose Einstein Condensation of spin-wave excitations or magnons. The coherent spin precession opened the way for observation and studies of the other phenomena owing its origin to the spin supercurrent, such as spin flow along the channel, phase slips at critical value of spin supercurrent, spin-current Josephson effect, spin-current vortices, nontopological solitons (analogous to Q-balls in high energy physics) etc. New measuring techniques based on coherent spin precession made possible to observe other novel phenomena in 3He superfluids, such as a mass vortex terminating on a soliton sheet, the Goldstone mode of the mass vortex with non-axisymmetric core in 3He-B etc. Recently, in ISSP, Kashiwa, Japan, the state with coherent precession of magnetization was found in 3He-A in squeezed aerogel.
Contact : Minoru Kubota (ext.63355)