Phase diagram of the Hubbard-Kondo lattice model from variational cluster approximation
| Autor: | J. P. L. Faye, P. Ram, Brijesh Kumar, David Sénéchal, Mikhail N. Kiselev |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Physics
Spins Condensed matter physics Strongly Correlated Electrons (cond-mat.str-el) Exchange interaction FOS: Physical sciences 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 01 natural sciences Square lattice Condensed Matter - Strongly Correlated Electrons Phase (matter) 0103 physical sciences Antiferromagnetism Condensed Matter::Strongly Correlated Electrons Kondo effect 010306 general physics 0210 nano-technology Lattice model (physics) Phase diagram |
| DOI: | 10.48550/arxiv.1804.00917 |
| Popis: | The interplay between the Kondo effect and magnetic ordering driven by the Ruderman-Kittel-Kasuya-Yosida interaction is studied within the two-dimensional Hubbard-Kondo lattice model. In addition to the antiferromagnetic exchange interaction, $J_\perp$, between the localized and the conduction electrons, this model also contains the local repulsion, $U$, between the conduction electrons. We use variational cluster approximation to investigate the competition between the antiferromagnetic phase, the Kondo singlet phase, and a ferrimagnetic phase on square lattice. At half-filling, the N\'eel antiferromagnetic phase dominates from small to moderate $J_\perp$ and $UJ_\perp$, and the Kondo singlet elsewhere. Sufficiently away from half-filling, the antiferromagnetic phase first gives way to a ferrimagnetic phase (in which the localized spins order ferromagnetically, and the conduction electrons do likewise, but the two mutually align antiferromagnetically), and then to the Kondo singlet phase. Comment: 6 pages, 6 figures |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|