Authors: Yu A Nefyodov A F Shevchun A M Shuvaev M R Trunin
Publish Date: 2007/02/09
Volume: 19, Issue: 7-8, Pages: 579-590
Abstract
Common and distinctive features of the temperature dependences of microwave surface impedance ZT=RT+iXT and conductivity σT in the abplane and along the caxis of highT c single crystals HTSC are discussed The main attention is focused on an evolution of these dependences in YBaCuO crystal with the oxygen deficiency Comparison of YBaCuO with other HTSC crystals reveals a number of peculiarities namely the linear dependence RabT ∞ T up to T c/2 in HTSC single crystals with tetragonal lattice and up to T c/3 in YBaCuO where R ab T shows also a broad peak at T∼ Tc/2 breakdown of normal skin effect in some HTSC crystals dramatic effect of pseudogap on the superfluid density in the heavily underdoped YBCO several orders of magnitude higher residual surface resistance in HTSC when compared to conventional superconductors etc Possible explanations are discussed in the context of the specific features of HTSC structure and in the framework of recent models of quasiparticles’ ctransport and pseudogap state in HTSC
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