Evolution of the magnetic properties in the antiferromagnet Ce2RhIn8 simultaneously doped with Cd and Ir
| Autor: | Christovam, Denise Sacramento, 1996, Freitas, Gabriel Silva, 1995, Piva, Mário Moda, 1992, Souza, Jean Carlo, 1993, Oliveira, Mário Malcolms de, 1994, Adriano, Cris, 1980, Pagliuso, Pascoal José Giglio, 1971 |
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| Přispěvatelé: | UNIVERSIDADE ESTADUAL DE CAMPINAS |
| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | Repositório da Produção Científica e Intelectual da Unicamp Universidade Estadual de Campinas (UNICAMP) instacron:UNICAMP Repositório Institucional da Unicamp |
| Popis: | Agradecimentos: We thank R. Tartaglia and P. Menegasso for helpful discussions. This work was supported by Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) (São Paulo, Brazil; Grants No. 2006/60440-0, No. 2009/09247-3, No. 2015/15665-3, No. 2017/10581-1, No. 2018/11364-7, No. 2018/26512-1, No. 2019/04196-3, and No. 2019/26247-9), Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) (Brazil), and Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) (Brazil). The staff at the BT-4 instrument are gratefully acknowledged for providing an outstanding scientific environment during these experiments. The authors also acknowledge the Center for Semiconducting Compounds and Nanotechnologies at UNICAMP for providing the equipment and technical support for the EDS experiments Abstract: 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 FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESP CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQ COORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL DE NÍVEL SUPERIOR - CAPES Fechado |
| Databáze: | OpenAIRE |
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