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| VOLUME 100 (2014) | ISSUE 2 | PAGE 134 |
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Multigap superconductivity in doped p-type cuprates
Ya. G. Ponomarev+, V. A. Alyoshin*, E. V. Antipov*, T. E. Oskina*, A. Krapf×, S. V. Kulbachinskii+°, M. G. Mikheev+, M. V. Sudakova+, S. N. Tchesnokov+, L. M. Fisher°
+Faculty of Physics, Lomonosov MSU, 119991 Moscow, Russia * Department of Chemistry, Lomonosov MSU, 119991 Moscow, Russia ×Institut fur Physik, Humboldt-Universität zu Berlin, D-12489 Berlin, Germany °Lenin Russian Electrotechnical Institute, 111250 Moscow, Russia
Abstract
Andreev and tunneling spectroscopy studies of Bi2Sr2Can-1CunO2n+4+δ, HgBa2Can-1CunO2n+2+δ and Tl2Ba2Can-1CunO2n+4+δ have shown that superconductivity in single-layer (n=1) and two-layer (n=2) phases has a single-gap character. Qualitatively different results were obtained for three-layer phases. In doped p-type Hg-1223, Bi-2223, and Tl-2223 samples two (or three) superconducting gaps were observed. The existence of multigap superconductivity in superconducting cuprates with  is explained by a difference
in doping
levels of outer (OP) and internal (IP) CuO2-planes.
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