Reply to "Comment on 'Nodeless pairing state in single-crystal YBa2Cu3O7'"

For YBa2Cu3O6.95, both fluxon depinning and a nodeless symmetry of the pairing holes are required to describe the μ+SR data. Our work properly identifies and corrects for the effects of fluxon depinning (with an activation temperature of about 20 K), and shows that the underlying ground-state symmetry is undoubtedly nodeless in character, consistent with s-wave or extended s-wave pairing. Fluxon depinning has also been independently confirmed by microwave studies indicating activated microscopic vortex pinning at low temperatures. While ignoring the fully established importance of fluxon depinning, Sonier continue to proffer the notion that the μ+SR data instead provide evidence of d-wave pairing (without fluxon pinning). Even a cursory examination of the published d-wave theories reveals that the predicted low-field linear-in-temperature signature of the d-wave penetration depth (claimed to have been observed in fields H≥0.2T by Sonier) should have been quenched by the magnetic fields applied. The fact that it was not quenched proves that the d-wave conjecture is incorrect: those authors continue to confuse the fluxon depinning evident at ∼20K with a nonexistent d-wave linear term.