Abstract
A mathematical method for constructing the superconducting classes for nontrivial superconductors is described, and all the phases that can be produced directly in a transition from the normal state are enumerated for the cubic, hexagonal and tetragonal symmetries. It is shown that in the triplet case the type of zeros in the energy gap always corresponds to points on the Fermi surface, whereas whole lines of zeros are possible in singlet pairing. For phases having zeros on lines or at points, the low-temperature heat capacity is proportional to T2and T 3, respectively. Superconducting phases that stem from non-one-dimensional representations can have a magnetic moment that generates currents on the surface of a single-domain sample even in the absence of an external magnetic field. A specific example of a domain wall is considered and it is shown that large magnetic currents flow in it.
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Volovik, G.E., Gor’kov, L.P. (1985). Superconducting classes in heavy-fermion systems. In: Ott, H.R. (eds) Ten Years of Superconductivity: 1980–1990. Perspectives in Condensed Matter Physics, vol 7. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-1622-0_14
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DOI: https://doi.org/10.1007/978-94-011-1622-0_14
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