Angular Dependence of the Nonlinear Transverse Magnetic Moment of YBCO in the Meissner state

Abstract

The angular dependence of the nonlinear transverse magnetic moment of untwinned high-quality single crystals of optimally doped YBCO have been studied at a temperature of 2.5K using a low frequency AC technique. The absence of any signature at angular period 2π/4is analyzed in light of the numerical predictions of such a signal for a pure d-wave order parameter with line nodes. Implications of this null result for the existence of a non-zero gap at all angles on the Fermi surface are discussed.

4 pages, 2 ps figures (submitted to Phys. Rev. Lett.)

References in corpus (3)

• Observation of d-wave scaling relations in the mixed-state specific heat of YBa2Cu3O7
• Is the nonlinear Meissner effect unobservable?
• Low Frequency Nonlinear Magnetic Response of an Unconventional Superconductor

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