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Evolution of the Magnetic Properties in the Antiferromagnet Ce2RhIn8 Simultaneously Doped with Cd and Ir



D. S. Christovam, G. S. Freitas, M. M. Piva, J. C. Souza, M. O. Malcolms, O. L. Canton, Juscelino Leao, William D. Ratcliff, Jeffrey W. Lynn, C. Adriano, P. G. Pagliuso


We report the evolution of the magnetic properties of Ce2Rh1−xIrxIn8−yCdy single crystals. In particular, for Ce2Rh0.5Ir0.5In8 (TN = 2.0 K) and Ce2Rh0.5Ir0.5In7.79Cd0.21 (TN = 4.2 K), we have solved the magnetic structure of these compounds using single crystal neutron magnetic diffraction experiments. Taking the magnetic structure of Ce2RhIn8 heavy fermion antiferromagnet as a reference, we have identified no changes in the q = (1/2, 1/2, 0) magnetic wave vector, however the direction of the ordered Ce3+ 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 Ce2RhIn8. Consistent with previous work, we find that Cd-doping in Ce2RhIn8 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 be not straightforward. These findings may shed light on the origin of the disordered spin-glass phase in the Ir-rich side of the phase diagram and also indicates that the Ce2MIn8 compounds may not follow exactly the same Rh-Ir CEF effects trend established for the CeMIn5 compounds.
Physical Review B


Magnetic Structures, Magnetic phase transitions, single crystals, susceptibility, crystal field effects.


Christovam, D. , Freitas, G. , Piva, M. , Souza, J. , Malcolms, M. , Canton, O. , Leao, J. , Ratcliff, W. , Lynn, J. , Adriano, C. and Pagliuso, P. (2020), Evolution of the Magnetic Properties in the Antiferromagnet Ce<sub>2</sub>RhIn<sub>8</sub> Simultaneously Doped with Cd and Ir, Physical Review B (Accessed November 30, 2023)
Created November 19, 2020, Updated August 30, 2021