Variational cluster approach to s-wave pairing in heavy-fermion superconductors
arXiv:1410.4707 · doi:10.1103/PhysRevB.91.104508
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 ( electron) and an electron, called the "- 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 - pairing is essential for the appearance of the s-wave superconductivity.
7 pages, 5 figures
References in corpus (12)
- Fulde-Ferrell-Larkin-Ovchinnikov State in Heavy Fermion Superconductors
- Variational cluster approach to correlated electron systems in low dimensions
- Two-Orbital Model Explains the Higher Transition Temperature of the Single-Layer Hg-Cuprate Superconductor Compared to That of the La-Cuprate Superconductor
- Variational cluster approach to spontaneous symmetry breaking: The itinerant antiferromagnet in two dimensions
- Self-energy-functional approach: Analytical results and the Mott-Hubbard transition
- Variational cluster approach to the Hubbard model: Phase-separation tendency and finite-size effects
- First order Mott transition at zero temperature in two dimensions: Variational plaquette study
- Phase separation and competition of superconductivity and magnetism in the two-dimensional Hubbard model: From strong to weak coupling
- Unconventional Superconductivity from Local Spin Fluctuations in the Kondo Lattice
- Mott transition in one dimension: Benchmarking dynamical cluster approaches
- Formation of Cooper pairs between conduction and localized electrons in heavy-fermion superconductors
- Antiferromagnetism versus Kondo screening in the two-dimensional periodic Anderson model at half filling: Variational cluster approach