Magnetic and metal-insulator transitions in coupled spin-fermion systems
Abstract
Here, we use quantum Monte Carlo to determine the magnetic and transport properties of coupled square lattice spin and fermionic planes as a model for a metal-insulator interface. Speci cally, layers of Ising spins with an intra-layer exchange constant J interact with the electronic spins of several adjoining metallic sheets via a coupling JH. Furthermore, when the chemical potential cuts across the band center, that is, at half- filling, the Neel temperature of antiferromagnetic (J > 0) Ising spins is enhanced by the coupling to the metal, while in the ferromagnetic case (J < 0) the metallic degrees of freedom reduce the ordering temperature. In the former case, a gap opens in the fermionic spectrum, driving insulating behavior, and the electron spins also order. This induced antiferromagnetism penetrates more weakly as the distance from the interface increases, and also exhibits a non-monotonic dependence on JH. Lastly, for doped lattices an interesting charge disproportionation occurs where electrons move to the interface layer to maintain half- filling there.
- Authors:
-
- Pennsylvania State Univ., University Park, PA (United States). Dept of Physics; Univ. of California, Davis, CA (United States). Dept. of Physics
- Univ. Federal do Rio de Janeiro, Rio de Janeiro (Brazil)
- Univ. of California, Davis, CA (United States). Dept. of Physics
- Publication Date:
- Research Org.:
- Univ. of California, Davis, CA (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 1344112
- Alternate Identifier(s):
- OSTI ID: 1180752; OSTI ID: 1344121
- Grant/Contract Number:
- NA0001842; NA0001842-0
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review. B, Condensed Matter and Materials Physics
- Additional Journal Information:
- Journal Volume: 90; Journal Issue: 14; Journal ID: ISSN 1098-0121
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Citation Formats
Mondaini, R., Paiva, T., and Scalettar, R. T. Magnetic and metal-insulator transitions in coupled spin-fermion systems. United States: N. p., 2014.
Web. doi:10.1103/PhysRevB.90.144418.
Mondaini, R., Paiva, T., & Scalettar, R. T. Magnetic and metal-insulator transitions in coupled spin-fermion systems. United States. https://doi.org/10.1103/PhysRevB.90.144418
Mondaini, R., Paiva, T., and Scalettar, R. T. Tue .
"Magnetic and metal-insulator transitions in coupled spin-fermion systems". United States. https://doi.org/10.1103/PhysRevB.90.144418. https://www.osti.gov/servlets/purl/1344112.
@article{osti_1344112,
title = {Magnetic and metal-insulator transitions in coupled spin-fermion systems},
author = {Mondaini, R. and Paiva, T. and Scalettar, R. T.},
abstractNote = {Here, we use quantum Monte Carlo to determine the magnetic and transport properties of coupled square lattice spin and fermionic planes as a model for a metal-insulator interface. Speci cally, layers of Ising spins with an intra-layer exchange constant J interact with the electronic spins of several adjoining metallic sheets via a coupling JH. Furthermore, when the chemical potential cuts across the band center, that is, at half- filling, the Neel temperature of antiferromagnetic (J > 0) Ising spins is enhanced by the coupling to the metal, while in the ferromagnetic case (J < 0) the metallic degrees of freedom reduce the ordering temperature. In the former case, a gap opens in the fermionic spectrum, driving insulating behavior, and the electron spins also order. This induced antiferromagnetism penetrates more weakly as the distance from the interface increases, and also exhibits a non-monotonic dependence on JH. Lastly, for doped lattices an interesting charge disproportionation occurs where electrons move to the interface layer to maintain half- filling there.},
doi = {10.1103/PhysRevB.90.144418},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
number = 14,
volume = 90,
place = {United States},
year = {Tue Oct 14 00:00:00 EDT 2014},
month = {Tue Oct 14 00:00:00 EDT 2014}
}
Web of Science