Phase coherence in YBCO-Pb SQUIDs: Direct experimental determination of the symmetry of the pairing state in high temperature superconductors

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

doi:10.1016/0921-4526(94)91334-X

Phase coherence in YBCO-Pb SQUIDs: Direct experimental determination of the symmetry of the pairing state in high temperature superconductors

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 describe an experiment designed to determine the symmetry of the pairing state in the cuprate superconductors. By studying the magnetic flux modulation of a dc SQUID formed by connecting tunnel junctions on the orthogonal faces of a YBCO single crystal with the conventional superconductor Pb, we can measure the spatial anisotropy of the phase of the order parameter. Preliminary results are complicated by SQUID asymmetries, but show evidence for a phase shift of π that is predicted for the d_x2_-y2 pairing state.

Original language	English (US)
Pages (from-to)	1669-1670
Number of pages	2
Journal	Physica B: Physics of Condensed Matter
Volume	194-196
Issue number	PART 2
DOIs	https://doi.org/10.1016/0921-4526(94)91334-X
State	Published - Feb 2 1994

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering

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10.1016/0921-4526(94)91334-X

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title = "Phase coherence in YBCO-Pb SQUIDs: Direct experimental determination of the symmetry of the pairing state in high temperature superconductors",

abstract = "We describe an experiment designed to determine the symmetry of the pairing state in the cuprate superconductors. By studying the magnetic flux modulation of a dc SQUID formed by connecting tunnel junctions on the orthogonal faces of a YBCO single crystal with the conventional superconductor Pb, we can measure the spatial anisotropy of the phase of the order parameter. Preliminary results are complicated by SQUID asymmetries, but show evidence for a phase shift of π that is predicted for the dx2-y2 pairing state.",

author = "Wollman, {D. A.} and {Van Harlingen}, {D. J.} and Lee, {W. C.} and Ginsberg, {D. M.} and Leggett, {A. J.}",

note = "Funding Information: * Supported by Materials Research Laboratory grant NSF-DMR89-20538, Science and Technology Center for Superconductivity grant NSF-STC91-20000, and a National Science Foundation Graduate Fellowship (DAW).",

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T2 - Direct experimental determination of the symmetry of the pairing state in high temperature superconductors

AU - Wollman, D. A.

AU - Van Harlingen, D. J.

AU - Lee, W. C.

AU - Ginsberg, D. M.

AU - Leggett, A. J.

N1 - Funding Information: * Supported by Materials Research Laboratory grant NSF-DMR89-20538, Science and Technology Center for Superconductivity grant NSF-STC91-20000, and a National Science Foundation Graduate Fellowship (DAW).

PY - 1994/2/2

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N2 - We describe an experiment designed to determine the symmetry of the pairing state in the cuprate superconductors. By studying the magnetic flux modulation of a dc SQUID formed by connecting tunnel junctions on the orthogonal faces of a YBCO single crystal with the conventional superconductor Pb, we can measure the spatial anisotropy of the phase of the order parameter. Preliminary results are complicated by SQUID asymmetries, but show evidence for a phase shift of π that is predicted for the dx2-y2 pairing state.

AB - We describe an experiment designed to determine the symmetry of the pairing state in the cuprate superconductors. By studying the magnetic flux modulation of a dc SQUID formed by connecting tunnel junctions on the orthogonal faces of a YBCO single crystal with the conventional superconductor Pb, we can measure the spatial anisotropy of the phase of the order parameter. Preliminary results are complicated by SQUID asymmetries, but show evidence for a phase shift of π that is predicted for the dx2-y2 pairing state.

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Phase coherence in YBCO-Pb SQUIDs: Direct experimental determination of the symmetry of the pairing state in high temperature superconductors

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