Angular Dependence of the Nonlinear Transverse Magnetic Moment of YBCO in the Meissner state
Anand Bhattacharya, Igor Zutic, Oriol T. Valls, Allen M. Goldman, Ulrich Welp, Boyd Veal
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.
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