Evidence for dx2−y2 Pairing from the Magnetic Field Modulation of YBa2Cu3O7-Pb Josephson Junctions

D. A. Wollman; D. J. Van Harlingen; J. Giapintzakis; D. M. Ginsberg

doi:10.1103/PhysRevLett.74.797

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Evidence for dx2−y2 Pairing from the Magnetic Field Modulation of YBa2Cu3O7-Pb Josephson Junctions

D. A. Wollman, D. J. Van Harlingen, J. Giapintzakis, D. M. Ginsberg

DOI 10.1103/PhysRevLett.74.797 · Physical Review Letters

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Abstract

We have measured the magnetic field modulation of the critical current of YBCO-Au-Pb Josephson junctions fabricated on the a and b edges and straddling the a−b corners of YBCO single crystals. In corner junctions, the critical current drops sharply at zero applied field and increases as the field is increased in either direction, in sharp contrast to the Fraunhofer diffraction patterns observed for single edge junctions. This behavior signifies a sign change of the order parameter between the a and b directions, strong direct evidence that the superconducting pairing state of YBCO has dx2−y2 symmetry.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Pb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown