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Science 19 January 1996:
Vol. 271. no. 5247, pp. 329 - 332
DOI: 10.1126/science.271.5247.329
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Research Articles

Pairing Symmetry in Single-Layer Tetragonal Tl2Ba2CuO Superconductors

C. C. Tsuei (1),  J. R. Kirtley,  M. Rupp,  J. Z. Sun,  A. Gupta,  M. B. Ketchen,  C. A. Wang,  Z. F. Ren,  J. H. Wang,  M. Bhushan

A high-resolution scanning superconducting quantum interference device microscopy study of tetragonal single-layer Tl2Ba2CuO films, deposited on tricrystal SrTiO3 substrates, demonstrates the effect of spontaneously generated half flux quanta. This observation shows that in addition to YBa2Cu3O7, the order parameter symmetry in Tl2Ba2CuO is consistent with that of a dx2-y2 pair state. This result also rules out any bilayer or twinning effects and any pairing that is incompatible with the fourfold rotational symmetry as in the Tl2Ba2CuO superconducting system.


C. C. Tsuei, J. R. Kirtley, M. Rupp, J. Z. Sun, A. Gupta, and M. B. Ketchen are at IBM Research Division, Thomas J. Watson Research Center, Yorktown Heights, NY 10598, USA. C. A. Wang, Z. F. Ren, and J. H. Wang are at Superconducting Materials Laboratory, Natural Sciences and Mathematics Complex, State University of New York, Buffalo, NY 14260, USA. M. Bhushan is at Department of Physics, State University of New York, Stony Brook, NY 11794, USA.
(1) To whom correspondence should be addressed.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)