Compressible Ferrimagnetism in the depleted Periodic Anderson Model

Abstract

Tight-binding Hamiltonians with single and multiple orbitals exhibit an intriguing array of magnetic phase transitions. In most cases the spin ordered phases are insulating, while the disordered phases may be either metallic or insulating. In this paper we report a Determinant Quantum Monte Carlo study of interacting electrons in a geometry which can be regarded as a two-dimensional Periodic Anderson Model with depleted interacting ($f$) orbitals. For a single depletion, we observe an enhancement of antiferromagnetic correlations and formation of localized states. For half of the $f$-orbitals regularly depleted, the system exhibits a ferrimagnetic ground state. We obtain a quantitative determination of the nature of magnetic order, which we discuss in the context of Tsunetsugu's theorem, and show that, although the dc conductivity indicates insulating behavior at half-filling, the compressibility remains finite.

12 pages, 13 figures

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• Coherence Temperature in the Diluted Periodic Anderson Model
• Determinant Quantum Monte Carlo Study of Exhaustion in the Periodic Anderson Model
• Percolation on Lieb lattices
• Quantum percolation on Lieb Lattices
• Selective Kondo strong coupling in magnetic impurity flat-band lattices
• Enhanced antiferromagnetic ordering tendency in staggered periodic Anderson model
• An intermediate phase induced by dilution in a correlated Dirac Fermi system
• Finite temperatures and flat bands: the Hubbard model on three-dimensional Lieb lattices
• Enhanced tendency of $d$-wave pairing and antiferromagnetism in doped staggered periodic Anderson model
• Kondo breakdown in multi-orbital Anderson lattices induced by destructive hybridization interference
• Tunable magnetism of a hexagonal Anderson droplet on the triangular lattice
• Spectral properties of strongly correlated multi impurity models in the Kondo insulator regime: Emergent coherence, metallic surface states and quantum phase transitions
• Anomalous isothermal compressibility in spin-orbit coupled degenerate Fermi gases
• Spin-orbit coupled periodic Anderson model: Kondo-Dirac semimetal and orbital-selective antiferromagnetic semimetal