Moment screening in the correlated Kondo lattice model
The magnetic correlations, local moments and the susceptibility in the correlated two-dimensional (2D) Kondo lattice model at half-filling are investigated. We calculate their systematic dependence on the control parameters J _K / t and U / t . An unbiased and reliable exact diagonalization approach...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
IOP Publishing
2012-01-01
|
| Series: | New Journal of Physics |
| Online Access: | https://doi.org/10.1088/1367-2630/14/10/103005 |
| _version_ | 1797751640837586944 |
|---|---|
| author | M Siahatgar B Schmidt G Zwicknagl P Thalmeier |
| author_facet | M Siahatgar B Schmidt G Zwicknagl P Thalmeier |
| author_sort | M Siahatgar |
| collection | DOAJ |
| description | The magnetic correlations, local moments and the susceptibility in the correlated two-dimensional (2D) Kondo lattice model at half-filling are investigated. We calculate their systematic dependence on the control parameters J _K / t and U / t . An unbiased and reliable exact diagonalization approach for ground state properties as well as the finite temperature Lanczos method (FTLM) for specific heat and the uniform susceptibility are employed for small tiles on the square lattice. They lead to two major results: firstly, we show that the screened local moment exhibits non-monotonic behavior as a function of U for weak Kondo coupling J _K . Secondly, the temperature dependence of the susceptibility obtained from the FTLM allows us to extract the dependence of the characteristic Kondo temperature scale T * on the correlation strength U . A monotonic increase of T * for small U is found, resolving the ambiguity of earlier investigations. In the large- U limit, the model is equivalent to the 2D Kondo necklace model with two types of localized spins. In this limit, the numerical results were compared with those of the analytical bond-operator method in the mean field treatment, and excellent agreement for the total paramagnetic moment was found, supporting the reliability of both methods. |
| first_indexed | 2024-03-12T16:51:30Z |
| format | Article |
| id | doaj.art-4304ca5c35f64c7c93c0d562397408fe |
| institution | Directory Open Access Journal |
| issn | 1367-2630 |
| language | English |
| last_indexed | 2024-03-12T16:51:30Z |
| publishDate | 2012-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | New Journal of Physics |
| spelling | doaj.art-4304ca5c35f64c7c93c0d562397408fe2023-08-08T11:08:30ZengIOP PublishingNew Journal of Physics1367-26302012-01-01141010300510.1088/1367-2630/14/10/103005Moment screening in the correlated Kondo lattice modelM Siahatgar0B Schmidt1G Zwicknagl2P Thalmeier3Max Planck Institute for Chemical Physics of Solids , 01187 Dresden, GermanyMax Planck Institute for Chemical Physics of Solids , 01187 Dresden, GermanyTechnical University Braunschweig , 0531 Braunschweig, GermanyMax Planck Institute for Chemical Physics of Solids , 01187 Dresden, GermanyThe magnetic correlations, local moments and the susceptibility in the correlated two-dimensional (2D) Kondo lattice model at half-filling are investigated. We calculate their systematic dependence on the control parameters J _K / t and U / t . An unbiased and reliable exact diagonalization approach for ground state properties as well as the finite temperature Lanczos method (FTLM) for specific heat and the uniform susceptibility are employed for small tiles on the square lattice. They lead to two major results: firstly, we show that the screened local moment exhibits non-monotonic behavior as a function of U for weak Kondo coupling J _K . Secondly, the temperature dependence of the susceptibility obtained from the FTLM allows us to extract the dependence of the characteristic Kondo temperature scale T * on the correlation strength U . A monotonic increase of T * for small U is found, resolving the ambiguity of earlier investigations. In the large- U limit, the model is equivalent to the 2D Kondo necklace model with two types of localized spins. In this limit, the numerical results were compared with those of the analytical bond-operator method in the mean field treatment, and excellent agreement for the total paramagnetic moment was found, supporting the reliability of both methods.https://doi.org/10.1088/1367-2630/14/10/103005 |
| spellingShingle | M Siahatgar B Schmidt G Zwicknagl P Thalmeier Moment screening in the correlated Kondo lattice model New Journal of Physics |
| title | Moment screening in the correlated Kondo lattice model |
| title_full | Moment screening in the correlated Kondo lattice model |
| title_fullStr | Moment screening in the correlated Kondo lattice model |
| title_full_unstemmed | Moment screening in the correlated Kondo lattice model |
| title_short | Moment screening in the correlated Kondo lattice model |
| title_sort | moment screening in the correlated kondo lattice model |
| url | https://doi.org/10.1088/1367-2630/14/10/103005 |
| work_keys_str_mv | AT msiahatgar momentscreeninginthecorrelatedkondolatticemodel AT bschmidt momentscreeninginthecorrelatedkondolatticemodel AT gzwicknagl momentscreeninginthecorrelatedkondolatticemodel AT pthalmeier momentscreeninginthecorrelatedkondolatticemodel |