Pairing Symmetry and Flux Quantization in a Tricrystal Superconducting Ring of YBa2Cu3O7-δ

Phys. Rev. Lett. 73, 593 – Published 25 July 1994
C. C. Tsuei, J. R. Kirtley, C. C. Chi, Lock See Yu-Jahnes, A. Gupta, T. Shaw, J. Z. Sun, and M. B. Ketchen

Abstract

We have used the concept of flux quantization in superconducting YBa2Cu3O7-δ rings with 0, 2, and 3 grain-boundary Josephson junctions to test the pairing symmetry in high-Tc superconductors. The magnetic flux threading these rings at 4.2 K is measured by employing a scanning superconducting quantum interference device microscope. Spontaneous magnetization of a half magnetic flux quantum, Φ02=h4e has been observed in the 3-junction ring, but not in the 2-junction rings. These results are consistent with d-wave pairing symmetry.

DOI: http://dx.doi.org/10.1103/PhysRevLett.73.593

  • Received 21 March 1994
  • Revised 19 May 1994
  • Published in the issue dated 25 July 1994

© 1994 The American Physical Society

Authors & Affiliations

C. C. Tsuei, J. R. Kirtley, C. C. Chi*, Lock See Yu-Jahnes, A. Gupta, T. Shaw, J. Z. Sun, and M. B. Ketchen

  • IBM Thomas J. Watson Research Center, P.O. Box 218, Yorktown Heights, New York 10598

  • *Present address: Materials Science Center and Department of Physics, National Tsing-Hua University, Taiwan, Republic of China.

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