Tuning the crystalline electric field and magnetic anisotropy along the CeCuBi2-xSbx series

Author(s):Show less -

Freitas, G. S. ; Piva, M. M. ; Grossi, R. ; Jesus, C. B. R. ; Souza, J. C. ; Christovam, D. S. ; Oliveira, N. F. ; Leao, J. B. ; Adriano, C. ; Lynn, J. W. ; Pagliuso, P. G.

• Document type: Journal article
• Source: PHYSICAL REVIEW B; v. 102, n. 15, p. 7-pg., 2020-10-20.

Abstract

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, CeCuBi2-xSbx. These compounds crystallize in a tetragonal structure with space group P4/nmm and present antiferromagnetic transition temperatures ranging from 3.6 to 16 K. Remarkably, the magnetization easy axis changes 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 anisotropic nearest-neighbor interactions and the tetragonal CEF Hamiltonian. The CEF parameters were obtained by fitting the magnetic susceptibility data with the constraints given by the INS measurements. Finally, we discuss how this CEF evolution can affect the Kondo physics and the search for a superconducting state in this family. (AU)

• FAPESP's process: 15/16191-5 - The research in new materials involving high magnetic fields and low temperatures
• Grantee: Gennady Gusev
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 17/25269-3 - High pressure studies in SrFe2As2, CaMn2Bi2 and CeAuBi2 compounds
• Grantee: Mário Moda Piva
• Support Opportunities: Scholarships abroad - Research Internship - Doctorate (Direct)
• FAPESP's process: 17/10581-1 - Emergent phenomena in reduced dimension systems
• Grantee: Pascoal Jose Giglio Pagliuso
• Support Opportunities: Special Projects
• FAPESP's process: 18/11364-7 - Magnetic properties of complex systems with non-trivial topology
• Grantee: Jean Carlo Souza
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 19/26247-9 - Emergent phenomena in Bi-based systems with low dimensionality
• Grantee: Gabriel Silva Freitas
• Support Opportunities: Scholarships in Brazil - Doctorate
• 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 Opportunities: Scholarships in Brazil - Doctorate (Direct)
• 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 Opportunities: Scholarships in Brazil - Master