Spin nematic order and superconductivity in J1−J2 Kondo lattice model on the square lattice

Sho Uraga; Yasuhiro Tada

doi:10.1103/PhysRevB.111.075110

← Back to search

Spin nematic order and superconductivity in J1−J2 Kondo lattice model on the square lattice

Sho Uraga, Yasuhiro Tada

DOI 10.1103/PhysRevB.111.075110 · Physical Review B

T1

Active bibliographic source — not scientific approval

Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.

Abstract

We investigate competition and cooperation of magnetic frustration and the Kondo effect in the J1−J2 Kondo lattice model on the square lattice at zero temperature. In this model, the frustrated interactions J1,J2 between the localized spins stabilize spin nematic orders, while the Kondo coupling favors local spin singlets. Using the slave boson mean field approximation, we find that the spin nematic order remains stable against small Kondo coupling, and the localized spins and the conduction electrons are effectively decoupled. On the other hand, a standard Fermi liquid state is formed for sufficiently strong Kondo interactions. Furthermore, in an intermediate region with moderate Kondo coupling, the spin nematic order and the Kondo effect coexist, and superconducting pairing of the conduction electrons is induced by the spinon pairing. We discuss the ground state phase diagram and nature of the quantum phase transitions between the different superconducting states.