Spin-1/2 XXZ Heisenberg cupolae: magnetization process and related enhanced magnetocaloric effect
The magnetization curves and magnetocaloric effect during the adiabatic demagnetization of antiferromagnetic spin-1/2 XXZ Heisenberg clusters with the shape of Johnson's solids (triangular cupola, square cupola and pentagonal cupola) are investigated using the exact numerical diagonalization fo...
| Main Author: | |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Institute for Condensed Matter Physics
2021-01-01
|
| Series: | Condensed Matter Physics |
| Subjects: | |
| Online Access: | https://doi.org/10.5488/CMP.23.43705 |
| _version_ | 1798027471961980928 |
|---|---|
| author | K. Karl'ová |
| author_facet | K. Karl'ová |
| author_sort | K. Karl'ová |
| collection | DOAJ |
| description | The magnetization curves and magnetocaloric effect during the adiabatic demagnetization of antiferromagnetic spin-1/2 XXZ Heisenberg clusters with the shape of Johnson's solids (triangular cupola, square cupola and pentagonal cupola) are investigated using the exact numerical diagonalization for different values of the exchange anisotropy ranging in between the Ising and fully isotropic limit. It is demonstrated that spin-1/2 XXZ Heisenberg cupolae display, in comparison with their Ising counterparts, at least one more magnetization plateau. The novel magnetization plateaux extends over a wider range of the magnetic fields with increasing of a quantum part of the XXZ exchange coupling at the expense of the original plateaux present in the limiting Ising case. It is shown that the spin-1/2 XXZ Heisenberg triangular and pentagonal cupolae exhibit an enhanced magnetocaloric effect in the vicinity of zero magnetic field, which makes these magnetic systems promising refrigerants for cooling down to ultra-low zero temperatures. |
| first_indexed | 2024-04-11T18:52:09Z |
| format | Article |
| id | doaj.art-99d57cb07a6f4456af6a27d3386e6035 |
| institution | Directory Open Access Journal |
| issn | 1607-324X 2224-9079 |
| language | English |
| last_indexed | 2024-04-11T18:52:09Z |
| publishDate | 2021-01-01 |
| publisher | Institute for Condensed Matter Physics |
| record_format | Article |
| series | Condensed Matter Physics |
| spelling | doaj.art-99d57cb07a6f4456af6a27d3386e60352022-12-22T04:08:19ZengInstitute for Condensed Matter PhysicsCondensed Matter Physics1607-324X2224-90792021-01-012344370510.5488/CMP.23.43705Spin-1/2 XXZ Heisenberg cupolae: magnetization process and related enhanced magnetocaloric effectK. Karl'ová The magnetization curves and magnetocaloric effect during the adiabatic demagnetization of antiferromagnetic spin-1/2 XXZ Heisenberg clusters with the shape of Johnson's solids (triangular cupola, square cupola and pentagonal cupola) are investigated using the exact numerical diagonalization for different values of the exchange anisotropy ranging in between the Ising and fully isotropic limit. It is demonstrated that spin-1/2 XXZ Heisenberg cupolae display, in comparison with their Ising counterparts, at least one more magnetization plateau. The novel magnetization plateaux extends over a wider range of the magnetic fields with increasing of a quantum part of the XXZ exchange coupling at the expense of the original plateaux present in the limiting Ising case. It is shown that the spin-1/2 XXZ Heisenberg triangular and pentagonal cupolae exhibit an enhanced magnetocaloric effect in the vicinity of zero magnetic field, which makes these magnetic systems promising refrigerants for cooling down to ultra-low zero temperatures.https://doi.org/10.5488/CMP.23.43705xxz heisenberg clustersmagnetization plateauxmagnetocaloric effect |
| spellingShingle | K. Karl'ová Spin-1/2 XXZ Heisenberg cupolae: magnetization process and related enhanced magnetocaloric effect Condensed Matter Physics xxz heisenberg clusters magnetization plateaux magnetocaloric effect |
| title | Spin-1/2 XXZ Heisenberg cupolae: magnetization process and related enhanced magnetocaloric effect |
| title_full | Spin-1/2 XXZ Heisenberg cupolae: magnetization process and related enhanced magnetocaloric effect |
| title_fullStr | Spin-1/2 XXZ Heisenberg cupolae: magnetization process and related enhanced magnetocaloric effect |
| title_full_unstemmed | Spin-1/2 XXZ Heisenberg cupolae: magnetization process and related enhanced magnetocaloric effect |
| title_short | Spin-1/2 XXZ Heisenberg cupolae: magnetization process and related enhanced magnetocaloric effect |
| title_sort | spin 1 2 xxz heisenberg cupolae magnetization process and related enhanced magnetocaloric effect |
| topic | xxz heisenberg clusters magnetization plateaux magnetocaloric effect |
| url | https://doi.org/10.5488/CMP.23.43705 |
| work_keys_str_mv | AT kkarlova spin12xxzheisenbergcupolaemagnetizationprocessandrelatedenhancedmagnetocaloriceffect |