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Directional tunneling and Andreev reflection on YBa 2Cu3O7 single crystals: Predominance of d-wave pairing symmetry verified with the generalized BTK theory

“Directional tunneling and Andreev reflection on YBa 2Cu3O7 single crystals: Predominance of d-wave pairing symmetry verified with the generalized BTK theory”, J. Y. T. Wei, N.-C. Yeh, D. F. Garrigus, and M. Strasik, Phys. Rev. Lett. 81, 2542 (1998).
http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.81.2542