Has the nonlinear Meissner effect been observed?

Abstract

We examine recent high-precision experimental data on the magnetic field, $\mathbf{H}$, dependence of the penetration depth $\lambda (H)$ in $\mathrm{YB}{\mathrm{a}}_2\mathrm{C}{\mathrm{u}}_3{\mathrm{O}}_{7-\delta }$ (YBCO) for several field directions in the $a-b$ plane. In a new theoretical analysis that incorporates the effects of orthorhombic symmetry, we show that the data at sufficiently high magnetic fields and low temperatures are in quantitative agreement with the theoretical predictions of the nonlinear Meissner effect.

4 text pages plus 3 postscript figures

References in corpus (1)

• Angular dependence of the penetration depth in unconventional superconductors

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