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First-order superconducting transition in the inter-band model

Authors
Journal
Physics Letters A
0375-9601
Publisher
Elsevier
Publication Date
Volume
378
Issue
20
Identifiers
DOI: 10.1016/j.physleta.2014.03.017
Keywords
  • Condensed Matter
Disciplines
  • Physics

Abstract

Abstract The comprehension about the theoretical features of superconductivity is an interesting and fundamental topic in condensed matter physics. Several theoretical proposals were considered to describe the new classes of superconducting compounds and alloys. In this work we propose to study a non-conventional superconducting system where the Cooper pairs are formed by fermions from different bands described via two band model with hybridization. In this inter-band scenario we find a first-order phase transition at low temperatures and we observe a tricritical point in the phase diagram. In our description, the control parameter is the hybridization that can be tuned by external pressure. This fact indicates the possibility to observe discontinuities in the SC gap amplitude through applying pressure on the system.

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