Record ID

UAM74f8d2847e5841109ba45f1fdce74fe5

Author

Wojciech Robert Czart Wojciech Robert Czart,, Zakład Teorii Materii Skondensowanej [nowa struktura organizacyjna] (SNŚ/WyF/JBWF)Szkoła Nauk Ścisłych [nowa struktura organizacyjna] (SNŚ)

Konrad Jerzy Kapcia Konrad Jerzy Kapcia,, Zakład Teorii Materii Skondensowanej [nowa struktura organizacyjna] (SNŚ/WyF/JBWF)Szkoła Nauk Ścisłych [nowa struktura organizacyjna] (SNŚ)

Roman Micnas Roman Micnas,, Zakład Teorii Materii Skondensowanej [nowa struktura organizacyjna] (SNŚ/WyF/JBWF)Szkoła Nauk Ścisłych [nowa struktura organizacyjna] (SNŚ)

Stanisław Robaszkiewicz Stanisław Robaszkiewicz,, Wydział Fizyki [nowa struktura organizacyjna] (SNŚ/WyF)Szkoła Nauk Ścisłych [nowa struktura organizacyjna] (SNŚ)

Journal series

Physica A-Statistical Mechanics and Its Applications, ISSN 0378-4371, e-ISSN 1873-2119

Issue year

2022

Vol

585

Article number

126403

Keywords in original language

Penson-Kolb model ; Unconventional superconductivity ; Eta-pairing ; Phase diagrams ; Kosterlitz–Thouless scenario ; Nonlocal pairing mechanism

ASJC Classification

2613 Statistics and Probability; 3104 Condensed Matter Physics

Abstract in original language

In the paper, we study the thermodynamic and electromagnetic properties of thePenson–Kolb (PK) model, i.e., the tight-binding model for fermionic particles with thepair-hopping interactionJ. We focus on the case of repulsiveJ(i.e.,J<0), which canstabilize the eta-pairing superconductivity with Cooper-pair center-of-mass momentum⃗q=⃗Q,⃗Q=(π/a,π/a,...). Numerical calculations are performed for severald-dimensional hypercubic lattices:d=2 (the square lattice, SQ),d=3 (the simple cubiclattice) andd= ∞hypercubic lattice (for arbitrary particle concentration 00asafunctionofnandpairingstrength.The analysis of the effects of the Fock term on the ground state phase boundaries andon selected PK model characteristics is performed as well as the influence of the phasefluctuations on the eta-pairing superconductivity is investigated. Within the Kosterlitz–Thouless scenario, the critical temperaturesTKTare estimated ford=2 SQ lattice andcompared with the critical temperatureTcobtained from HFA. We also determine thetemperatureTmat which minimal gap between two quasiparticle bands vanishes in theeta-phase. Our results for repulsiveJare contrasted with those found earlier for the PKmodel with attractiveJ(i.e., withJ>0).

DOI

DOI:10.1016/j.physa.2021.126403 Opening in a new tab

Language

eng (en) English

License

CC BY

Score (nominal)

70

Score source

journalList

Score

Ministerial score = 70.0, 18-05-2022, ArticleFromJournal

Publication indicators

WoS Citations = 0; Scopus Citations = 0; Scopus SNIP: 2016 = 1.324; WoS Impact Factor: 2019 (2 years) = 2.924 - 2019 (5 years) =2.625

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