Orbital-Controlled Superconductivity in f-Electron Systems

Abstract

We propose a concept of superconductivity controlled by orbital degree of freedom taking CeMIn5 (M= Co, Rh, and Ir) as typical examples. A microscopic multiorbital model for CeMIn5 is analyzed by fluctuation exchange approximation. Even though the Fermi-surface structure is unchanged, the ground state is found to change significantly among paramagnetic, antiferromagnetic, and d-wave superconducting phases, depending on the dominant orbital component in the band near the Fermi energy. We show that our picture naturally explains the different low-temperature properties of CeMIn5 by carefully analyzing the crystalline electric field states.

5 pages, 4 figures

References in corpus (3)

• Ferromagnetic fluctuation and possible triplet superconductivity in Na_xCoO_2*yH_2O: Fluctuation-exchange study of multi-orbital Hubbard model
• Ferromagnetic and triplet-pairing instabilities controlled by the trigonal distortion of the CoO_6 octahedra in Na_xCoO_2*yH_2O
• Perturbation Theory on the Superconductivity of Heavy Fermion Superconductors CeIr_{x}Co_{1-x}In_5

Cited by in corpus (4)

• Pairing symmetry in a two-orbital Hubbard model on a square lattice
• Robust d-wave Pairing Correlations in the Heisenberg Kondo Lattice Model
• Fulde-Ferrell-Larkin-Ovchinnikov State in the absence of a Magnetic Field
• Evidence for the existence of Kondo coupled resonant modes in heavy fermions