Vortex viscosity in YBa2Cu3O7-δ at low temperatures

Y. Matsuda, N. P. Ong, Y. F. Yan, J. M. Harris, J. B. Peterson

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With a bolometric technique, we have measured, in intense fields, the low-temperature surface resistance of both 90- and 60-K YBa2Cu3O7-δ single crystals. In the former, the observed vortex viscosity ηeff=5×10-5 N s/m2 exceeds by 2 orders of magnitude the viscosity in conventional superconductors. This corresponds to a normal-state resistivity of 0.4 μΩ cm, and a quasiparticle lifetime τ∼6 ps. (The corresponding numbers for the 60-K crystal are ηeff=2.5×10-6 N s/m2 and τ=1.9 ps at 3 K.) These lifetimes place YBa2Cu3O7-δ firmly in the superclean regime where the lifetime broadening of core energy levels is much less than the energy spacing. We discuss how a very large Hall angle in this regime affects the analysis of surface resistance.

Original languageEnglish (US)
Pages (from-to)4380-4383
Number of pages4
JournalPhysical Review B
Issue number6
StatePublished - 1994

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics


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