Spin rotation induced by applied pressure in the Cd-doped Ce2RhIn8 intermetallic compound

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Christovam, D. S. ; Giles, C. ; Mendonca-Ferreira, L. ; Leao, J. ; Ratcliff, W. ; Lynn, J. W. ; Ramos, S. ; Hering, E. N. ; Hidaka, H. ; Baggio-Saitovich, E. ; Fisk, Z. ; Pagliuso, P. G. ; Adriano, C.

• Tipo de documento: Artigo Científico
• Fonte: PHYSICAL REVIEW B; v. 100, n. 16, p. 6-pg., 2019-10-21.

Resumo

The pressure evolution of the magnetic properties of the Ce2RhIn7.79Cd0.21 heavy fermion compound was investigated by single crystal neutron magnetic diffraction and electrical resistivity experiments under applied pressure. From the neutron magnetic diffraction data, up to P = 0.6 GPa, we found no changes in the magnetic structure or in the ordering temperature T-N = 4.8 K. However, the increase of pressure induces an interesting spin rotation of the ordered antiferromagnetic moment of Ce2RhIn7.79Cd0.21 into the ab tetragonal plane. From the electrical resistivity measurements under pressure, we have mapped the evolution of T-N and the maximum of the temperature dependent electrical resistivity (T-MAX) as a function of the pressure (P less than or similar to 3.6 GPa). To gain some insight into the microscopic origin of the observed spin rotation as a function of pressure, we have also analyzed some macroscopic magnetic susceptibility data at ambient pressure for pure and Cd-doped Ce2RhIn8 using a mean-field model including tetragonal crystalline electric field (CEF). The analysis indicates that these compounds have a Kramers doublet Gamma(-)(7)-type ground state, followed by a Gamma(+)(7) first excited state at Delta(1) similar to 80 K and a Gamma(6) second excited state at Delta(2) similar to 270 K for Ce2RhIn8 and Delta(2) similar to 250 K for Ce2RhIn7.79Cd0.21. The evolution of the magnetic properties of Ce2RhIn8 as a function of Cd doping and the rotation of the direction of the ordered moment for the Ce2RhIn7.79Cd0.21 compound under pressure suggest important changes of the single ion anisotropy of Ce3+ induced by applying pressure and Cd doping in these systems. These changes are reflected in modifications in the CEF scheme that will ultimately affect the actual ground state of these compounds. (AU)

• Processo FAPESP: 17/10581-1 - Fenômenos emergentes em sistemas de dimensões reduzidas
• Beneficiário: Pascoal Jose Giglio Pagliuso
• Modalidade de apoio: Auxílio à Pesquisa - Projetos Especiais
• Processo FAPESP: 09/09247-3 - Investigação de estados ordenados induzidos sob pressão em novos materiais.
• Beneficiário: Cris Adriano
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 19/04196-3 - Estudos de efeitos de campo elétrico cristalino nos estados magnéticos e supercondutores nos compostos Ce2RhIn8-xCdx
• Beneficiário: Denise Sacramento Christovam
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 06/60440-0 - Estudo de sistemas fortemente correlacionados em condições extremas
• Beneficiário: Carlos Rettori
• Modalidade de apoio: Auxílio à Pesquisa - Temático