Pairing symmetry in single-layer tetragonal Tl2Ba2CuO6+δ superconductors

A high-resolution scanning superconducting quantum interference device microscopy study of tetragonal single-layer [TI.sub.2][Ba.sub.2][CuO.sub.6+δ] films, deposited on tricrystal [SrTiO.sub.3] substrates, demonstrates the effect of spontaneously generated half flux quanta. This observation shows th...

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Bibliographic Details
Published in:Science (American Association for the Advancement of Science) 1996-01, Vol.271 (5247), p.329-332
Main Authors: TSUEI, C. C, KIRTLEY, J. R, RUPP, M, SUN, J. Z, GUPTA, A, KETCHEN, M. B, WANG, C. A, REN, Z. F, WANG, J. H, BHUSHAN, M
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Electronic structure
Exact sciences and technology
High temperature superconductivity
Physics
Properties of type I and type II superconductors
Superconductivity
Superconductors
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Summary:A high-resolution scanning superconducting quantum interference device microscopy study of tetragonal single-layer [TI.sub.2][Ba.sub.2][CuO.sub.6+δ] films, deposited on tricrystal [SrTiO.sub.3] substrates, demonstrates the effect of spontaneously generated half flux quanta. This observation shows that in addition to [YBa.sub.2][Cu.sub.3][O.sub.7], the order parameter symmetry in [TI.sub.2][Ba.sub.2][CuO.sub.6+δ] is consistent with that of a [d.sub.[x.sup.2]-[y.sup.2]] 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 [TI.sub.2][Ba.sub.2][CuO.sub.6+δ], superconducting system.
ISSN:0036-8075
1095-9203
DOI:10.1126/science.271.5247.329