Influence of nonequilibrium phonons on the energy gap of superconductors

Journal Article · Tue Jan 31 23:00:00 EST 1984 · Sov. J. Low Temp. Phys. (Engl. Transl.); (United States)

OSTI ID:6042325

Bar'yakhtar, V G; Seminozhenko, V P; Shafranyuk, S E

We consider the influence of isotropic phonon pumping at frequency ..cap omega.. on the magnitude of the energy gap ..delta.. in the spectrum of the quasiparticle excitations of a superconductor. It is shown that close to the superconducting transition temperature T/sub c/, when the frequency is ..cap omega..<2..delta.., a strengthening of the superconductivity (an increase in ..delta.. and in T/sub c/) may occur due mainly to the direct influence of the distribution of nonequilibrium (real) phonons on the virtual Cooper pairing process. This mechanism is more effective than the mechanism of stimulated superconductivity of Eliashberg by the parameter (lambda (..cap omega../T/sub c/)(..cap omega.. tau/sub epsilon-c/))/sup -1/ when ..cap omega..<<2..delta.. (where lambda is the BCS pairing constant and tau/sub epsilon-c/ is the energy relaxation time for the quasiparticles).

• Research Organization: Physicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR, Kharkov
• OSTI ID: 6042325
• Journal Information: Sov. J. Low Temp. Phys. (Engl. Transl.); (United States), Journal Name: Sov. J. Low Temp. Phys. (Engl. Transl.); (United States) Vol. 10:2; ISSN SJLPD
• Country of Publication: United States
• Language: English

Related Subjects

656101* -- Solid State Physics-- Superconductivity-- General Theory-- (-1987)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
COOPER PAIRS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ENERGY GAP
ENERGY-LEVEL TRANSITIONS
EXCITATION
GORKOV-ELIASHBERG THEORY
ORDER PARAMETERS
PHONONS
PHYSICAL PROPERTIES
QUASI PARTICLES
SUPERCONDUCTIVITY