Field Induced Reduction of the Low Temperature Superfluid Density in YBa2Cu3O6.95

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  • 30 June 1999
Abstract
A novel high magnetic field (8 T) spectrometer for muon spin rotation has been used to measure the temperature dependence of the in-plane magnetic penetration depth in YBa2Cu3O6.95. Measurements of the penetration depth are sensitive to the reduction of the superfluid density due to the excitation of quasiparticles, thus yielding information about the symmetry of the energy gap which forms at the Fermi surface in the superconducting state. At low H and low T, the penetration depth exhibits the characteristic linear T-dependence associated with the energy gap of a pure d-wave superconductor. However, at higher fields the penetration depth is essentially temperature independent below a characteristic temperature T*(H). We discuss possible interpretations of this surprising new feature in the low-energy excitation spectrum.

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