Phys. Rev. Lett. 74, 4523–4526 (1995)Experimental Proof of a Time-Reversal-Invariant Order Parameter with a π shift in YBa2Cu3O7-δReceived 25 July 1994; published in the issue dated 29 May 1995 To determine the symmetry of the order parameter in superconducting YBa2Cu3O7-δ (YBCO), we use a scanning SQUID microscope at 4.2 K to perform independent experiments on six YBCO-Ag-Pb SQUIDs. We find completely unambiguous evidence for a time-reversal-invariant order parameter with a phase shift of π between the a and b directions of YBCO. Our results are inconsistent with purely s-wave symmetric pairing and are strongly suggestive of dx2-y2 symmetric pairing in YBCO. © 1995 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.74.4523
DOI:
10.1103/PhysRevLett.74.4523
PACS:
74.50.+r, 74.20.Mn, 74.72.Bk
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