Open AccessCharacteristic features of the pseudogap and superconducting states of YBa2Cu3O7−x
Author(s) -
O. V. Misochko,
Nikolai I. Georgiev,
T. Dekorsy,
M. Helm
Publication year - 2002
Publication title -
jetp letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 79
eISSN - 1090-6487
pISSN - 0021-3640
DOI - 10.1134/1.1503329
Subject(s) - pseudogap , condensed matter physics , quasiparticle , superconductivity , fermi surface , anisotropy , relaxation (psychology) , physics , solid state physics , excitation , materials science , femtosecond , charge carrier , high temperature superconductivity , optics , quantum mechanics , psychology , social psychology , laser , cuprate
The relaxation dynamics of the lattice and low-energy quasiparticles in a YBa2Cu3O7−x superconductor are studied by the light reflection technique with femtosecond temporal resolution in a wide temperature range. It is shown that, for T>Tc, there exist two temperature regions with qualitatively and quantitatively different excitation dynamics, and the transition between these regions is of a hysteretic nature. It is also found that the character of changes observed in the charge carrier relaxation dynamics in the superconducting state testifies to the presence of an anisotropic gap with nodes at the Fermi surface.
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