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Doping-dependent nonlinear Meissner effect and spontaneous currents in high-Tc superconductors

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Fil.: Maiorov, B. Comisión Nacional de Energía Atómica. Instituto Balseiro; Argentina; Los Alamos National Laboratory; Estados Unidos
Fil.: Lee, S.-C. University of Maryland; Estados Unidos
Fil.: Osquiguil, E. Comisión Nacional de Energía Atómica. Instituto Balseiro; Argentina
Fil.: Sullivan, M. University of Maryland; Estados Unidos
Fil.: Ruchti, G.R. University of Maryland; Estados Unidos
Fil.: Anlage, S.M. University of Maryland; Estados Unidos
Fil.: Palmer, B.S. Laboratory for Physical Sciences; Estados Unidos

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Centro Atómico Bariloche

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eng

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We measure the local harmonic generation from superconducting thin films at microwave frequencies to investigate the intrinsic nonlinear Meissner effect near Tc in the zero magnetic field. Both second and third harmonic generation are measured to identify time-reversal symmetry breaking (TRSB) and time-reversal symmetric (TRS) nonlinearities. We perform a systematic doping-dependent study of the nonlinear response and find that the TRS characteristic nonlinearity current density scale follows the doping dependence of the depairing critical current density. We also extract a spontaneous TRSB characteristic current density scale that onsets at Tc, grows with decreasing temperature, and systematically decreases in magnitude (at fixed T∕Tc) with underdoping. The origin of this current scale could be Josephson circulating currents or the spontaneous magnetization associated with a TRSB order parameter.

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Physical Review B – Condensed Matter and Materials Physics. Vol. 71, no. 1 (2005), p. 014507

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