1987
Zieliński, J.; Entel, P.; Pietruszka, M. A.
Quasi-particle description of cross-over effects in two-band superconductors Journal Article
In: Zeitschrift für Physik B Condensed Matter, vol. 66, no. 2, pp. 161-166, 1987, ISSN: 07223277, (3).
@article{2-s2.0-34250102085,
title = {Quasi-particle description of cross-over effects in two-band superconductors},
author = { J. Zieliński and P. Entel and M.A. Pietruszka},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-34250102085&doi=10.1007%2fBF01311651&partnerID=40&md5=6128081a1326caac9b24d874beaf8a08},
doi = {10.1007/BF01311651},
issn = {07223277},
year = {1987},
date = {1987-01-01},
journal = {Zeitschrift für Physik B Condensed Matter},
volume = {66},
number = {2},
pages = {161-166},
publisher = {Springer-Verlag},
abstract = {The possibility of singlet-like superconductivity in a hybridized two-band system is investigated. We reformulate the problem in terms of quasi-particle states originating from narrow f-like band and conduction band states. An effective BCS-like Hamiltonian for heavy and light quasi-particles is derived. The stability of these two types of Cooper pairs is studied by using the occupation number of heavy particles as an input parameter. Our results provide strong support for the assumption that in this kind of two-band system a cross-over effect can be observed. For large enough values of the input parameter superconductivity is mainly supported by heavy quasi-particles. By reducing the occupation number superconductivity is taken over by the light quasi-particles. The relevance of the results for heavy-fermion superconductors is discussed. © 1987 Springer-Verlag.},
note = {3},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The possibility of singlet-like superconductivity in a hybridized two-band system is investigated. We reformulate the problem in terms of quasi-particle states originating from narrow f-like band and conduction band states. An effective BCS-like Hamiltonian for heavy and light quasi-particles is derived. The stability of these two types of Cooper pairs is studied by using the occupation number of heavy particles as an input parameter. Our results provide strong support for the assumption that in this kind of two-band system a cross-over effect can be observed. For large enough values of the input parameter superconductivity is mainly supported by heavy quasi-particles. By reducing the occupation number superconductivity is taken over by the light quasi-particles. The relevance of the results for heavy-fermion superconductors is discussed. © 1987 Springer-Verlag.
Zieliński, J.; Pietruszka, M. A.
On the phonon induced hybrid pairing in two band superconductors Journal Article
In: Solid State Communications, vol. 63, no. 11, pp. 1023-1025, 1987, ISSN: 00381098, (3).
@article{2-s2.0-0023417952,
title = {On the phonon induced hybrid pairing in two band superconductors},
author = { J. Zieliński and M.A. Pietruszka},
url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-0023417952&doi=10.1016%2f0038-1098%2887%2990653-3&partnerID=40&md5=9ffa475cb5156048ca8d995930f9b957},
doi = {10.1016/0038-1098(87)90653-3},
issn = {00381098},
year = {1987},
date = {1987-01-01},
journal = {Solid State Communications},
volume = {63},
number = {11},
pages = {1023-1025},
abstract = {The role of hybrid pairing originating from electron-phonon interaction has been investigated for a two band (f{hook} and d) superconductor at T = 0. This type of pairing seems to be less important than f{hook}-f{hook} pairing for the case of half-filled f{hook}-band when the latter type of Cooper pairs plays the dominating role. On the other hand, for the case of rather filled (or rather empty) f{hook}-band, the superconducting properties of the system are mainly determined by the formation of conduction electrons d-d pairs. © 1987.},
note = {3},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
The role of hybrid pairing originating from electron-phonon interaction has been investigated for a two band (f{hook} and d) superconductor at T = 0. This type of pairing seems to be less important than f{hook}-f{hook} pairing for the case of half-filled f{hook}-band when the latter type of Cooper pairs plays the dominating role. On the other hand, for the case of rather filled (or rather empty) f{hook}-band, the superconducting properties of the system are mainly determined by the formation of conduction electrons d-d pairs. © 1987.