Spatial dispersion of spin susceptibility of conduction electrons in a superconductor

Journal Article · Thu Feb 01 00:00:00 EST 1979 · Sov. Phys. - JETP (Engl. Transl.); (United States)

OSTI ID:5893098

Kochelaev, B I; Tagirov, L R; Khusainov, M G

The method of temperature Green's functions is used to investigate the spatial dispersion of the spin susceptibility of the conduction electrons in pure and ''dirty'' (i.e., containing magnetic and nonmagnetic impurities) superconductors. The Hamiltonian of the indirect exchange interaction of the localized moments is also obtained. It is shown that in a pure superconductor the susceptibility and the indirect-exchange Hamiltonian have an additional nonoscillating and longer-range term that is exponentially cut off at a distance on the order of the coherence length xi/sub 0/. For a dirty superconductor, the Fourier transform chi (q) of the susceptibility is obtained for an arbitrary wave vector q. In the p/sub 0/r>>1 approximation, a transition is effected to the coordinate space. It is shown that the effective radius of the indirect exchange interaction potential, which is equal to the mean free path l/sub p/ in a normal metal, increases abruptly on going into the superconducting state, to a new coherence length xiapprox. = (xi/sub 0/l/sub p/)/sup 1/2/>>l/sub p/.

• Research Organization: Kazan' State University
• OSTI ID: 5893098
• Journal Information: Sov. Phys. - JETP (Engl. Transl.); (United States), Vol. 49:2
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
SUPERCONDUCTORS
MAGNETIC SUSCEPTIBILITY
EXCHANGE INTERACTIONS
GREEN FUNCTION
HAMILTONIANS
FUNCTIONS
INTERACTIONS
MAGNETIC PROPERTIES
MATHEMATICAL OPERATORS
PHYSICAL PROPERTIES
QUANTUM OPERATORS
656101* - Solid State Physics- Superconductivity- General Theory- (-1987)