Absence of broken time reversal symmetry beneath the surface of YBCO films

Abstract

We report the results of a search for spontaneous magnetism due to a time reversal symmetry breaking phase in the superconducting state of (110)-oriented YBCO films, expected near the surface in this geometry. Zero field and weak transverse field measurements performed using the low-energy muon spin rotation technique with muons implanted few nm inside optimally-doped YBCO-(110) films show no appearance of spontaneous magnetic fields below the superconducting temperature down to 2.9 K. Our results give an upper limit of ~0.02 mT for putative spontaneous internal fields.

5 pages

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• Order parameter node removal in the d-wave superconductor $YB{a}_{2}C{u}_3{O}_{7-x}$ under magnetic field
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Cited by in corpus (12)

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• Generation of odd-frequency surface superconductivity with spontaneous spin current due to the zero-energy Andreev bound state
• Tunnelling conductance of $d+ip$-wave superconductor
• Flux Phase in Bilayer $t-J$ Model
• Flux Phase in Bilayer $t-J$ Model: Time-Reversal Symmetry Breaking Surface State without Spontaneous Magnetic Field
• Ginzburg-Landau Theory for Flux Phase and Superconductivity in $t-J$ Model
• Niobium's intrinsic coherence length and penetration depth revisited using low-energy muon spin spectroscopy and secondary-ion mass spectrometry
• Spontaneous Magnetic Field near a Time-Reversal Symmetry Broken Surface State of YBCO
• Zero-Field Surface Charge Due to the Gap Suppression in $d$-Wave Superconductors
• Spontaneous Magnetic Field and Local Density of States near a Time-Reversal Symmetry Broken Surface State of YBCO