Phys. Rev. Lett. 74, 4523 - 4526 (1995)

Experimental Proof of a Time-Reversal-Invariant Order Parameter with a π shift in YBa₂Cu₃O_7-δ

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A. Mathai, Y. Gim, R. C. Black, A. Amar, and F. C. Wellstood
Center for Superconductivity Research, Department of Physics, University of Maryland, College Park, Maryland 20742-4111

Received 25 July 1994

To determine the symmetry of the order parameter in superconducting YBa₂Cu₃O_7-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 d_x²-y² symmetric pairing in YBCO.

URL: http://link.aps.org/abstract/PRL/v74/p4523
DOI: 10.1103/PhysRevLett.74.4523
PACS: 74.50.+r, 74.20.Mn, 74.72.Bk

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Phys. Rev. Lett. 74, 4523 - 4526 (1995)

Experimental Proof of a Time-Reversal-Invariant Order Parameter with a π shift in YBa2Cu3O7-δ

PRL Celebrates 50 Years

Experimental Proof of a Time-Reversal-Invariant Order Parameter with a π shift in YBa₂Cu₃O_7-δ