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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Evolution of the magnetic properties in the antiferromagnet Ce2RhIn8 simultaneously doped with Cd and Ir

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Christovam, D. S. [1] ; Freitas, G. S. [1] ; Piva, M. M. [1, 2] ; Souza, J. C. [1] ; Malcolms, M. O. [1] ; Canton, O. L. [3] ; Leao, J. B. [4] ; Ratcliff, W. [4] ; Lynn, J. W. [4] ; Adriano, C. [1] ; Pagliuso, P. G. [1]
Total Authors: 11
[1] Univ Estadual Campinas, Inst Fis Gleb Wataghin, BR-13083970 Campinas, SP - Brazil
[2] Max Planck Inst Chem Phys Solids, Nothnitzer Str 40, D-01187 Dresden - Germany
[3] Univ Estadual Paulista UNESP, Inst Fis Teor, BR-01140070 Sao Paulo, SP - Brazil
[4] NIST, Ctr Neutron Res, Gaithersburg, MD 20899 - USA
Total Affiliations: 4
Document type: Journal article
Source: Physical Review B; v. 102, n. 19 NOV 20 2020.
Web of Science Citations: 0

We report the evolution of the magnetic properties of Ce2Rh1-xIrxIn8-yCdy single crystals. In particular, for Ce2Rh0.5Ir0.5In8 (T-N = 2.0 K) and Ce2Rh0.5Ir0.5In7.79Cd0.21(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 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 Jr 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 Jr 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 Jr-rich side of the phase diagram and also indicate that the Ce2MIn8 compounds may not follow exactly the same Rh-Ir CEF effects trend established for the CeMIn5 compounds. (AU)

FAPESP's process: 19/04196-3 - Investigation of crystalline electric field effects in magnetic and superconducting states in the Ce2RhIn8-xCdx compounds
Grantee:Denise Sacramento Christovam
Support type: Scholarships in Brazil - Master
FAPESP's process: 06/60440-0 - Study of strongly correlated systems in extreme conditions
Grantee:Carlos Rettori
Support type: Research Projects - Thematic Grants
FAPESP's process: 18/11364-7 - Magnetic properties of complex systems with non-trivial topology
Grantee:Jean Carlo Souza
Support type: Scholarships in Brazil - Doctorate
FAPESP's process: 17/10581-1 - Emergent phenomena in reduced dimension systems
Grantee:Pascoal Jose Giglio Pagliuso
Support type: Research Projects - Thematic Grants
FAPESP's process: 09/09247-3 - Investigation of pressure induced ordered states in novel complex materials.
Grantee:Cris Adriano
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 19/26247-9 - Emergent phenomena in Bi-based systems with low dimensionality
Grantee:Gabriel Silva Freitas
Support type: Scholarships in Brazil - Doctorate
FAPESP's process: 18/26512-1 - Biological dynamics on networks
Grantee:Otavio Luiz Canton
Support type: Scholarships in Brazil - Master
FAPESP's process: 15/15665-3 - Studies of orbital differentiation effects in the magnetic and superconducting properties of FeAs based compounds
Grantee:Mário Moda Piva
Support type: Scholarships in Brazil - Doctorate (Direct)