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2
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84927892579
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(1988)
Chem. Lett.
, vol.55
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Urayama, H.1
Yamochi, H.2
Saito, G.3
Nozawa, K.4
Sugano, T.5
Kinoshita, M.6
Sato, S.7
Oshima, K.8
Kawamoto, A.9
Tanaka, J.10
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8
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84927892577
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They call those superconductors ``conventional'' in which gauge symmetry is the only broken symmetry, i.e., the order parameter has the same symmetry as the underlying crystal. A superconductor with additional broken symmetries they call ``unconventional.'' For spherical Fermi surfaces, ``anisotropic'' and ``unconventional'' have the same meaning (since any anisotropic state will break the spherical symmetry). In a lattice, however, a state described by an order parameter with lines or points of zeroes on the Fermi surface that is invariant under the symmetry group of the lattice is conventional but anisotropic. Since we are interested in the existence or nonexistence of these lines or points in the gap, is anisotropic superconductors we want to identify—be they conventional or not.
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26
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4244149978
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(1986)
Phys. Rev. Lett.
, vol.56
, pp. 2513
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Einzel, D.1
Hirschfeld, P.J.2
Gross, F.3
Chandrasekhar, B.S.4
Andres, K.5
Ott, H.R.6
Beuers, J.7
Fisk, Z.8
Smith, J.L.9
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47
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84927892575
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Δ hat is a matrix in particle-hole space. It is antisymmetric because of the conventional factor τ hat3 in (3.2) and n o t because we are looking on even-parity superconductors.
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53
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84927892573
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Remember that the parameter R describes the i n t r i n s i c reflectivity of the interface that has nothing to do with superconductivity. Only for E >> Δ0 do we get RN-> R.
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54
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84927892571
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P. A. M. Benistant, Ph. D. thesis, University of Nijmegen, 1984.
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55
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84927892570
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H. F. C. Hoevers, Ph.D. thesis, University of Nijmegen, 1987.
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59
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84927892564
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A. C. Mota, Habilitationsschrift, ETH Zürich, 1988.
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61
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84927892563
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To obtain (C4) from (5.9), we have to use (C3) and lcurl s hat , d hat rcurl =0 which follows from the normalization condition g hat2= - π2 and usual tricks like ( a vec cdot τ vec ) ( b vec cdot τ vec ) = a vec cdot b vec + i ( a vec times b vec ) cdot τ vec.
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