Size, disorder, and charge doping effects in the antiferromagnetic series Eu1-AGa4 (A = Ca, Sr, or La)
| Autor: | Emilia Morosan, James C. Fettinger, Chien-Lung Huang, Macy Stavinoha, Susan M. Kauzlarich, Kasey P. Devlin |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Doping 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences Electronic Optical and Magnetic Materials Inorganic Chemistry Tetragonal crystal system Magnetization Crystallography Electrical resistivity and conductivity Materials Chemistry Ceramics and Composites Antiferromagnetism Physical and Theoretical Chemistry 0210 nano-technology Anisotropy Single crystal Monoclinic crystal system |
| Zdroj: | Journal of Solid State Chemistry. 285:121232 |
| ISSN: | 0022-4596 |
| DOI: | 10.1016/j.jssc.2020.121232 |
| Popis: | EuGa4 hosts a magnetic Eu2+ sublattice surrounded by a network of covalently-bound Ga atoms with the BaAl4 structure type (space group I4/ m m m ). In this study, we present the synthesis and characterization of three new single crystal substitutional series Eu A x 1 − x Ga4 with A = Ca, Sr, or La. X-ray diffraction and resistivity measurements show that Ca substitution induced a structural phase transition from the tetragonal crystal structure at high temperatures to the monoclinic crystal structure (CaGa4 type, space group C2/m) at low temperatures and suppressed the antiferromagnetic ordering temperature to 8.8 K for x = 0.45. Comparatively, La or Sr substitution maintained the tetragonal crystal structure and suppressed the antiferromagnetic ordering temperatures to 6.7 K and 1.6 K for (A, x) = (La, 0.37) and (Sr, 0.91), respectively. In addition to suppressing the magnetic order, magnetization and specific heat measurements indicate the onset of anisotropic metamagnetic transitions in (La, 0.18), (La, 0.37), and (Sr, 0.63), along with an incommensurate-to-commensurate magnetic transition in (Sr, 0.38). By comparing these effects of doping EuGa4, we show how size, disorder, and charge determine the structure-physical property relations in EuGa4. |
| Databáze: | OpenAIRE |
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