Evolution of the magnetic properties in the antiferromagnet Ce2RhIn8 simultaneously doped with Cd and Ir
| Autor: | J. B. Leão, William Ratcliff, M. O. Malcolms, J. C. Souza, J. W. Lynn, P. G. Pagliuso, Cris Adriano, O. L. Canton, G. S. Freitas, D. S. Christovam, M. M. Piva |
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| Rok vydání: | 2020 |
| Předmět: |
Physics
Magnetic moment Magnetic structure 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Crystallography Tetragonal crystal system Excited state 0103 physical sciences Antiferromagnetism Condensed Matter::Strongly Correlated Electrons Connection (algebraic framework) 010306 general physics 0210 nano-technology Energy (signal processing) Phase diagram |
| Zdroj: | Physical Review B. 102 |
| ISSN: | 2469-9969 2469-9950 |
| Popis: | We report the evolution of the magnetic properties of ${\mathrm{Ce}}_{2}{\mathrm{Rh}}_{1\ensuremath{-}x}{\mathrm{Ir}}_{x}{\mathrm{In}}_{8\ensuremath{-}y}{\mathrm{Cd}}_{y}$ single crystals. In particular, for ${\mathrm{Ce}}_{2}{\mathrm{Rh}}_{0.5}{\mathrm{Ir}}_{0.5}{\mathrm{In}}_{8}$ (${T}_{N}$ = 2.0 K) and ${\mathrm{Ce}}_{2}{\mathrm{Rh}}_{0.5}{\mathrm{Ir}}_{0.5}{\mathrm{In}}_{7.79}{\mathrm{Cd}}_{0.21}$ (${T}_{N}$ = 4.2 K), we have solved the magnetic structure of these compounds using single-crystal neutron magnetic diffraction experiments. Taking the magnetic structure of the ${\mathrm{Ce}}_{2}\mathrm{Rh}{\mathrm{In}}_{8}$ heavy-fermion antiferromagnet as a reference, we have identified no changes in the $\mathbf{q}=(\frac{1}{2},\frac{1}{2},0)$ magnetic wave vector; however, the direction of the ordered ${\mathrm{Ce}}^{3+}$ moments rotates toward the $ab$ plane, under the influence of both dopants. By constraining the analysis of the crystalline electric field (CEF) with the experimental ordered moment's direction and high-temperature magnetic-susceptibility data, we have used a mean-field model with tetragonal CEF and exchange interactions to gain insight into the CEF scheme and anisotropy of the CEF ground-state wave function when Cd and Ir are introduced into ${\mathrm{Ce}}_{2}\mathrm{Rh}{\mathrm{In}}_{8}$. Consistent with previous work, we find that Cd doping in ${\mathrm{Ce}}_{2}\mathrm{Rh}{\mathrm{In}}_{8}$ tends to rotate the magnetic moment toward the $ab$ plane and lower the energy of the CEF excited states' levels. Interestingly, the presence of Ir also rotates the magnetic moment towards the $ab$ plane although its connection to the CEF overall splitting evolution for the $y$ = 0 samples may not be straightforward. These findings may shed light on the origin of the disordered spin-glass phase on the Ir-rich side of the phase diagram and also indicate that the ${\mathrm{Ce}}_{2}M{\mathrm{In}}_{8}$ compounds may not follow exactly the same Rh-Ir CEF effects trend established for the $\mathrm{Ce}M{\mathrm{In}}_{5}$ compounds. |
| Databáze: | OpenAIRE |
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