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arXiv · 1410.4707

Variational cluster approach to s-wave pairing in heavy-fermion superconductors

Keisuke Masuda·Daisuke Yamamoto
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Abstract

We study s-wave Cooper pairing in heavy-fermion systems. We analyze the periodic Anderson model by means of the variational cluster approach (VCA) focusing on the interorbital Cooper pairing between a conduction electron ($c$ electron) and an $f$ electron, called the "$c$-$f$ pairing." It is shown that the s-wave superconductivity appears coexisting with long-range antiferromagnetic order when electrons or holes are doped into the system at half filling. The antiferromagnetic order vanishes when the doping concentration exceeds a certain critical value, leading to a pure s-wave superconducting state. Moreover, the comparative study with different reference systems used in the VCA shows that the interorbital $c$-$f$ pairing is essential for the appearance of the s-wave superconductivity.

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Keisuke Masuda, Daisuke Yamamoto. 2015-03-13. Variational cluster approach to s-wave pairing in heavy-fermion superconductors. https://doi.org/10.1103/physrevb.91.104508

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