| Autor: |
Freitas GS; Instituto de Física 'Gleb Wataghin', UNICAMP, Campinas-SP, 13083-859, Brazil., Piva MM; Instituto de Física 'Gleb Wataghin', UNICAMP, Campinas-SP, 13083-859, Brazil., Grossi R; Instituto de Física 'Gleb Wataghin', UNICAMP, Campinas-SP, 13083-859, Brazil., Jesus CBR; Instituto de Física 'Gleb Wataghin', UNICAMP, Campinas-SP, 13083-859, Brazil.; Programa de Pós-Graduação em Física, Campus Prof. José Aluísio de Campos, UFS, 49100-000, São Cristóvão, SE, Brazil., Souza JC; Instituto de Física 'Gleb Wataghin', UNICAMP, Campinas-SP, 13083-859, Brazil., Christovam DS; Instituto de Física 'Gleb Wataghin', UNICAMP, Campinas-SP, 13083-859, Brazil., Oliveira NF Jr; Instituto de Física, Universidade de São Paulo, São Paulo-SP, 05508-090, Brazil., Leão JB; NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD 20899-6102., Adriano C; Instituto de Física 'Gleb Wataghin', UNICAMP, Campinas-SP, 13083-859, Brazil., Lynn JW; NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD 20899-6102., Pagliuso PG; Instituto de Física 'Gleb Wataghin', UNICAMP, Campinas-SP, 13083-859, Brazil. |
| Abstrakt: |
We have performed X-ray powder diffraction, magnetization, electrical resistivity, heat capacity and inelastic neutron scattering (INS) to investigate the physical properties of the intermetallic series of compounds CeCuBi 2 - x Sb x . These compounds crystallize in a tetragonal structure with space group P 4 ∕ n m m and present antiferromagnetic transition temperatures ranging from 3.6 K to 16 K. Remarkably, the magnetization easy axis changed along the series, which is closely related to the variations of the tetragonal crystalline electric field (CEF) parameters. This evolution was analyzed using a mean field model, which included an anisotropic nearest-neighbor interactions and the tetragonal CEF Hamiltonian. We obtained the CEF parameters by fitting the magnetic susceptibility data with the constraints given by the INS measurements. More broadly, we discuss how this CEF evolution can affect the Kondo physics and the search for a superconducting state in this family. |
