Superconductivity in Ce-based heavy-fermion systems under high pressure

Van-Nham Phan
Phys. Rev. B 101, 245120 – Published 4 June 2020

Abstract

In this paper, the possibility of a superconducting state mediated by the valence fluctuations in Ce-based heavy-fermion systems under high pressure is investigated for the extended periodic Anderson model. In this extended version, an additional local Coulomb repulsion between the localized and conduction electrons is included. In the framework of the projector-based renormalization method, we derive self-consistent equations for the superconducting order parameters. Our numerical evaluation for a two-dimensional case specifies that superconductivity in the heavy-fermion systems has a d-wave character and is mediated by valence fluctuations. By use of some additional simplifications, a BCS-like equation is found; an effective pairing interaction then is delivered. The interaction depends strongly on momentum and becomes dominant in the valence transition regime.

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  • Received 9 March 2020
  • Revised 18 May 2020
  • Accepted 19 May 2020

DOI:https://doi.org/10.1103/PhysRevB.101.245120

©2020 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Van-Nham Phan*

  • Institute of Research and Development, Duy Tan University, Da Nang 550000, Vietnam and Faculty of Natural Sciences, Duy Tan University, Da Nang 550000, Vietnam

  • *Corresponding author: phanvannham@duytan.edu.vn

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Issue

Vol. 101, Iss. 24 — 15 June 2020

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