Nonlinear transverse magnetic moment in anisotropic superconductors

Igor Žutić; Oriol T. Valls

doi:10.1103/PhysRevB.54.15500

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Nonlinear transverse magnetic moment in anisotropic superconductors

Igor Žutić, Oriol T. Valls

DOI 10.1103/PhysRevB.54.15500 · Physical Review B

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Abstract

We consider the nonlinear transverse magnetic moment that arises in the Meissner state of superconductors with a strongly anisotropic order parameter. We compute this magnetic moment as a function of applied field and geometry, assuming d-wave pairing, for realistic samples, finite in all three dimensions, of high-temperature superconducting materials. Return currents, shape effects, and the anisotropy of the penetration depth tensor are all included. We numerically solve the nonlinear Maxwell-London equations for a finite system. Results are discussed in terms of the relevant parameters. The effect, which is a probe of the order parameter symmetry in the bulk, not just the surface, of the sample should be readily measurable if pairing is in a d-wave state. Failure to observe it would set a lower bound to the s-wave component.