Nonequilibrium states in superconductors with a charge density wave under tunneling injection

Journal Article · Sun Jul 01 04:00:00 EDT 1984 · Sov. J. Low Temp. Phys. (Engl. Transl.); (United States)

OSTI ID:5746863

Molotkov, S N

The nonequilibrium states arising under tunneling injection in superconductors with a structural transition are investigated. The case of symmetrical SD--I--SD tunnel junction is examined (SD is the superconductor in which the structural rearrangement of the lattice and a charge density wave (CDW) appear due to the characteristics of the single-particle electronic spectrum of the symmetrical metallic phase; I is the insulator). It is shown that when a voltage close to the threshold for creation of Cooper quasiparticles is applied to the tunnel junction, a threshold instability, leading to an S-shaped current--voltage characteristic, arises. As a result of this, layered Umklapp waves are possible (in the case when the external voltage is fixed) between states with different values of the superconducting order parameter and of the amplitude of the CDW. With a fixed current such inhomogeneous distributions are stationary. The general restrictions on the magnitude of the nonequilibrium quasiparticle distribution function n(epsilon-c), when the quasiparticles are created by the source in an energy range greatly exceeding the dielectric and superconducting gaps, are also discussed. In the general case, the restriction n(epsilon-c) <1/2, which holds in the usual superconductors, is absent in superconductors with CDW. This fact can in principle lead to a diffusion instability and to paramagnetism in nonequilibrium superconductors with CDW.

• Research Organization: Institute of Solid State Physics, Academy of Sciences of the USSR, Chernogolovka, Moscow Province
• OSTI ID: 5746863
• Journal Information: Sov. J. Low Temp. Phys. (Engl. Transl.); (United States), Journal Name: Sov. J. Low Temp. Phys. (Engl. Transl.); (United States) Vol. 10:7; ISSN SJLPD
• Country of Publication: United States
• Language: English

Related Subjects

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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CRYSTAL-PHASE TRANSFORMATIONS
DISTRIBUTION FUNCTIONS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRONIC STRUCTURE
FUNCTIONS
INSTABILITY
JUNCTIONS
MAGNETISM
PARAMAGNETISM
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
PLASMA WAVES
QUASI PARTICLES
SUPERCONDUCTING JUNCTIONS
TUNNEL EFFECT