| Title: |
Intracluster interactions in butterfly { Fe3 LnO2} molecules with the non-Kramers ions TbIII and HoIII |
| Authors: |
Badia-Romano, L.; Rubin, J.; Bartolome, F.; Bartolome, J.S.; Luzon, J.; Prodius, D.N.; Продиус, Д.Н.; Turtă, C.I.; Turta, C.; Turté, K.I.; Turta, K.I.; Туртэ, К.И.; Mereacre, V.M.; Meriakre, V.M.; Meriacre, V.M.; Мереакре, В.М.; Wilhelm, F.; Rogalev, A. |
| Source: |
Physical Review B - Condensed Matter and Materials Physics (6) 0-0 |
| Publication Year: |
2015 |
| Description: |
The intracluster exchange interactions within the quot;butterflyquot; [Fe3Lnmu;3-O2CCl3COO8H2OTHF3] molecules, where LnIII represents a lanthanide cation, have been determined by a combination of x-ray magnetic circular dichroism XMCD and vibrating sample magnetometry VSM along with an interaction model. We have studied the compounds with Ln=Tb and Ho, both non-Kramers lanthanides and with high uniaxial anisotropy, and Ln=LuIII and YIII as pseudolanthanides, which supply nonmagnetic Ln reference cases. At low temperature, the three Fe atoms can be considered as a self-unit with total spin SFe3=5/2. Using the element selectivity of the XMCD magnetometry, measured at the Ln L2,3 edges, together with the VSM measurements, the local magnetization of the Ln ion and the Fe3 subcluster, as a function of the field and low temperature Tasymp;2.5K, has been determined separately. These results are described quantitatively in the framework of a theoretical model based on an effective spin Hamiltonian, which considers the competing effects of intracluster interactions and the external applied magnetic field. The Ln-Fe3 exchange interaction within the {Fe3LnO2} cluster has been determined to be antiferromagnetic, in both Tb and Ho compounds, with JFeTb/kB=-0.131K and JFeHo/kB=-0.181K, respectively. In both cases, a field-induced reorientation of the Fe3 and Ln spins from antiparallel to parallel orientation takes place at a threshold field mu;0H=1.1 and 2 T, for the {Fe3TbO2} and {Fe3HoO2} compounds, respectively. By comparison with other compounds of the series with uniaxial anisotropy, it is concluded that the polarizability of the Fe3 subcluster magnetic moment decreases in the trend {Fe3YO2}rarr;{Fe3TbO2}rarr;{Fe3HoO2}rarr;{Fe3DyO2}, because of the increasing opposition of the exchange antiferromagnetic field caused by the Ln ion. In the Ln=Tb, Ho, and Dy, the magnetization of the whole molecule is dominated by the anisotropy of the Ln ion. The intracluster Fe3-Ln exchange interactions are very weak compared to the Ln ... |
| Document Type: |
article in journal/newspaper |
| File Description: |
application/pdf |
| Language: |
English |
| ISSN: |
10980121 |
| Relation: |
https://ibn.idsi.md/vizualizare_articol/181189; urn:issn:10980121 |
| DOI: |
10.1103/PhysRevB.92.064411 |
| Availability: |
https://ibn.idsi.md/vizualizare_articol/181189; https://doi.org/10.1103/PhysRevB.92.064411 |
| Rights: |
info:eu-repo/semantics/openAccess |
| Accession Number: |
edsbas.1C4AA4E5 |
| Database: |
BASE |