Degeneracy of electronic states and the 'anomalous' kinetics of a nonlinear response of high-temperature superconductors in pump-probe spectroscopy

Journal Article · Wed Aug 31 00:00:00 EDT 2005 · Quantum Electronics (Woodbury, N.Y.)

DOI:https://doi.org/10.1070/QE2005V035N08ABEH008973· OSTI ID:21470815

Bobyrev, Yu V; Petnikova, V M; Rudenko, K V; Shuvalov, Vladimir V ^[1]

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1. International Laser Center, M. V. Lomonosov Moscow State University, Moscow (Russian Federation)

It is shown that all the spectral-temporal and temperature anomalies of a nonlinear response of high-temperature superconductors (HTSCs) observed in the pump-probe spectroscopy at high excitation levels can be interpreted taking into account contributions of interband electronic transitions to the dielectric constant of an excited HTSC film with a 'frozen' energy gap in the electronic spectrum. A model is constructed which explains all these 'anomalies' by a drastic decrease in the rates of three-particle nonradiative recombination of excess carriers under strong degeneracy conditions. It is found that this situation takes place due to the specific distribution of the density of electronic states in a HTSC almost immediately after the 'opening' of the energy gap in the electronic spectrum. (nonlinear optical phenomena)

• OSTI ID: 21470815
• Journal Information: Quantum Electronics (Woodbury, N.Y.), Vol. 35, Issue 8; Other Information: DOI: 10.1070/QE2005v035n08ABEH008973; ISSN 1063-7818
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
DENSITY
DISTRIBUTION
ELECTRON SPECTRA
ELECTRONIC STRUCTURE
ENERGY GAP
EXCITATION
HIGH-TC SUPERCONDUCTORS
NONLINEAR PROBLEMS
PERMITTIVITY
RECOMBINATION
SPECTROSCOPY
THIN FILMS
DIELECTRIC PROPERTIES
ELECTRICAL PROPERTIES
ENERGY-LEVEL TRANSITIONS
FILMS
PHYSICAL PROPERTIES
SPECTRA
SUPERCONDUCTORS
TYPE-II SUPERCONDUCTORS