Spin Rotation Induced by Applied Pressure in Cd-Doped Ce2RhIn8 Intermetallic Compound

Published

October 21, 2019

Author(s)

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

Abstract

The pressure evolution of the magnetic properties of the Ce₂RhIn_7.79Cd_0.21 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 nor 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 the Ce₂RhIn_7.79Cd_0.21 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<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 Ce}d^RhIn₈ using a mean field model including tetragonal crystalline electric field (CEF). The analysis indicates that these compounds have a Kramers double Gamma}¹₇-type ground state, followed by a Γ²_{7% first excited state at Δ}}d1^ 80 K and a Γ₆ second excited state at Δ}_{2 270 K for Ce}d2^RhIn₈ and Δ}₂ 250 K for Ce₂RhIn_7.79Cd_{0.21. The evolution of the magnetic properties of Ce}d2^RhIn₈ as a function of Cd-doping and the rotation of the direction of the ordered moment for the Ce₂RhIn_7.79Cd_.0.21 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.

Citation

Physical Review B

Volume

100

Issue

16

Pub Type

Journals

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Keywords

Magnetic Neutron Diffraction, Pressure Dependence, Spin rotation, heavy fermion, long range magnetic order

Citation

Christovam, D. , Giles, C. , Mendonca-Ferreira, L. , Leao, J. , Ratcliff, W. , Lynn, J. , Ramos, S. , Hering, E. , Hidaka, H. , Baggio-Saitovich, E. , Fisk, Z. , Pagliuso, P. and Adriano, C. (2019), Spin Rotation Induced by Applied Pressure in Cd-Doped Ce₂RhIn₈ Intermetallic Compound, Physical Review B, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=928480 (Accessed October 2, 2025)