C.C. Tsuei, J.R. Kirtley, et al.
Physica C: Superconductivity and its Applications
Paper
Pairing symmetry in single-layer tetragonal Tl2Ba2CuO6+δ superconductors
Abstract
A high-resolution scanning superconducting quantum interference device microscopy study of tetragonal single-layer Tl2Ba2CuO6+δ 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 Tl2Ba2CuO6+δ 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 Tl2Ba2CuO6+δ superconducting system.
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