Physics – Condensed Matter – Superconductivity
Scientific paper
2004-05-26
Phys. Rev. B 71, 014507 (2005).
Physics
Condensed Matter
Superconductivity
7 pages, 5 figures, re-submitted to PRB in Sep 2004
Scientific paper
10.1103/PhysRevB.71.014507
We measure the local harmonic generation from superconducting thin films at microwave frequencies to investigate the intrinsic nonlinear Meissner effect near Tc in 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 de-pairing 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 under-doping. The origin of this current scale could be Josephson circulating currents or the spontaneous magnetization associated with a TRSB order parameter.
Anlage Steven M.
Lee Sheng-Chiang
Maiorov Boris
Osquiguil Eduardo
Palmer Benjamin
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