Phase competition in the double-exchange model on the frustrated pyrochlore lattice

Abstract

Competition between the ferromagnetic double-exchange interaction and the super-exchange antiferromagnetic interaction is theoretically studied in the presence of geometrical frustration. As increasing the super-exchange interaction, the ferromagnetic metal becomes unstable, and is taken over by a cooperative paramagnetic metal, in sharp contrast with a discontinuous transition to the antiferromagnetic insulator in the absence of frustration. In the critical region, the system exhibits a peculiar temperature-independent behavior with highly incoherent transport, suggesting a large residual entropy at low temperatures. We discuss the relevance of the results to the pressure-induced behaviors in Mo pyrochlore oxides [S. Iguchi et al., Phys. Rev. Lett. 102, 136407 (2009)].

5 pages, 5 figures, accepted for publication in Phys. Rev. Lett

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Cited by in corpus (22)

• Frustration-induced insulating chiral spin state in itinerant triangular-lattice magnets
• Noncoplanar magnetic ordering driven by itinerant electrons on the pyrochlore lattice
• Spin superstructure and noncoplanar ordering in metallic pyrochlore magnets with degenerate orbitals
• Spontaneous Spatial Inversion Symmetry Breaking and Spin Hall Effect in a Spin-ice Double-exchange Model on a Pyrochlore Lattice
• Spontaneous formation of kagome network and Dirac half-semimetal on a triangular lattice
• Coupled spin-charge order in frustrated itinerant triangular magnets
• Electronic phase separation in the pyrochlore double-exchange model
• Dimensional crossover and the magnetic transition in electron doped manganites
• Itinerant electrons in the Coulomb phase
• Color ice states, weathervane modes, and order by disorder in the bilinear-biquadratic pyrochlore Heisenberg antiferromagnet
• Amorphous ferromagnetism and re-entrant magnetic glassiness in Sm${}_2$Mo${}_2$O${}_7$: new insights into the electronic phase diagram of pyrochlore molybdates
• Orbital degeneracy and Mott transition in Mo pyrochlore oxides
• Spin-orbital liquids and insulator-metal transitions on the pyrochlore lattice
• Traversing the pyrochlore stability diagram; microwave-assisted synthesis and discovery of mixed B-site Ln${}_2$InSbO${}_7$ family
• Monte Carlo Study of an Effective Ising Model for the Spin-ice type Kondo Lattice Model
• Polynomial Expansion Monte Carlo Study of Frustrated Itinerant Electron Systems: Application to a Spin-ice type Kondo Lattice Model on a Pyrochlore Lattice
• Application of polynomial-expansion Monte Carlo method to a spin-ice Kondo lattice model
• Mott transition and anomalous resistive state in the pyrochlore molybdates
• Robust noncoplanar magnetism in band filling-tuned (Nd${}_{1-x}$Ca${}_x$)${}_2$Mo${}_2$O${}_7$
• Double exchange model on triangular lattice: non-coplanar spin configuration and phase transition near quarter filling
• Orbital Mott transition in two dimensional Pyrochlore lattice
• Emergence of topological defects and spin liquid in a two-orbital spin-fermion model on the honeycomb lattice