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

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• Crystal-field and Kondo scale investigation of CeMIn5 (M=Co, Ir and Rh): a combined x-ray absorption and inelastic neutron study
• Quasiparticle interference in heavy Fermion superconductor CeCoIn_5
• Effective Crystalline Electric Field Potential in a j-j Coupling Scheme
• Role of vertex corrections in the matrix formulation of the random phase approximation for the multiorbital Hubbard model
• Double-Exchange Ferromagnetism and Orbital-Fluctuation-Induced Superconductivity in Cubic Uranium Compounds
• Robust d-wave Pairing Correlations in the Heisenberg Kondo Lattice Model
• Multipole Susceptibility of Multiorbital Anderson Model Coupled with Jahn-Teller Phonons
• Fermi-Surface Topology and Pairing Symmetry in BiS${}_2$-Based Layered Superconductors
• Fulde-Ferrell-Larkin-Ovchinnikov State in the absence of a Magnetic Field
• Anisotropic Superconductivity Emerging from the Orbital Degrees of Freedom in a ${\Gamma }_3$ Non-Kramers Doublet System
• Nematic and time-reversal breaking superconductivities coexisting with quadrupole order in a ${\Gamma }_3$ system
• H-wave -- A Python package for the Hartree-Fock approximation and the random phase approximation
• Octupolar edge state in an $e_g$ orbital system on a square lattice
• Evidence for the existence of Kondo coupled resonant modes in heavy fermions
• Flat Surface State with Octupole Moment in an $e_g$ Orbital System on a Simple Cubic Lattice