Experimental determination of the superconducting pairing state in YBCO from the phase coherence of YBCO-Pb dc SQUIDs

D. A. Wollman; D. J. Van Harlingen; W. C. Lee; D. M. Ginsberg; A. J. Leggett

doi:10.1103/PhysRevLett.71.2134

Experimental determination of the superconducting pairing state in YBCO from the phase coherence of YBCO-Pb dc SQUIDs

D. A. Wollman, D. J. Van Harlingen, W. C. Lee, D. M. Ginsberg, A. J. Leggett

Physics

Research output: Contribution to journal › Article › peer-review

Abstract

We present an experiment designed to determine directly the symmetry of the pairing state in the cuprate superconductors. From the magnetic flux modulation of YBCO-Pb dc SQUIDs, we determine the spatial anisotropy of the phase of the order parameter in single crystals of YBCO. The experimental results are complicated by SQUID asymmetries and the trapping of magnetic vortices, but taken as a whole give rather strong evidence for a phase shift of π that is predicted for the d_x2-y2 pairing state. This is further corroborated by single junction modulation measurements.

Original language	English (US)
Pages (from-to)	2134-2137
Number of pages	4
Journal	Physical review letters
Volume	71
Issue number	13
DOIs	https://doi.org/10.1103/PhysRevLett.71.2134
State	Published - 1993

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abstract = "We present an experiment designed to determine directly the symmetry of the pairing state in the cuprate superconductors. From the magnetic flux modulation of YBCO-Pb dc SQUIDs, we determine the spatial anisotropy of the phase of the order parameter in single crystals of YBCO. The experimental results are complicated by SQUID asymmetries and the trapping of magnetic vortices, but taken as a whole give rather strong evidence for a phase shift of π that is predicted for the dx2-y2 pairing state. This is further corroborated by single junction modulation measurements.",

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AU - Wollman, D. A.

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AU - Lee, W. C.

AU - Ginsberg, D. M.

AU - Leggett, A. J.

PY - 1993

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AB - We present an experiment designed to determine directly the symmetry of the pairing state in the cuprate superconductors. From the magnetic flux modulation of YBCO-Pb dc SQUIDs, we determine the spatial anisotropy of the phase of the order parameter in single crystals of YBCO. The experimental results are complicated by SQUID asymmetries and the trapping of magnetic vortices, but taken as a whole give rather strong evidence for a phase shift of π that is predicted for the dx2-y2 pairing state. This is further corroborated by single junction modulation measurements.

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Experimental determination of the superconducting pairing state in YBCO from the phase coherence of YBCO-Pb dc SQUIDs

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