X-ray spectroscopic investigation of crystal fields in Ce2Rh1-xIrxIn8 heavy 
fermions

Christovam, D. S.; Mariono, A.; Falke, J.; Liu, C. -e.; Chang, C.-F.; Kuo, C.-Y.; Stockert, O.; Wirth, S.; Haverkort, M. W.; Zwicknagl, G.; Severing, A.; Rosa, P. F. S.; Caffer, A. M.; Carvalho, M. H.; Pagliuso, P. G.

doi:10.1103/PhysRevB.110.075161

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X-ray spectroscopic investigation of crystal fields in Ce₂Rh_1-xIr_xIn₈ heavy fermions

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Christovam, D. S.
Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons252729

Mariono, A.
Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons257328

Falke, J.
Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons126565

Chang, C.-F.
Chun-Fu Chang, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons126717

Kuo, C.-Y.
Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons126865

Stockert, O.
Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons126910

Wirth, S.
Steffen Wirth, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons197306

Zwicknagl, G.
Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

/persons/resource/persons204677

Severing, A.
Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Christovam, D. S., Mariono, A., Falke, J., Liu, C.-.-e., Chang, C.-F., Kuo, C.-Y., et al. (2024). X-ray spectroscopic investigation of crystal fields in Ce₂Rh_1-xIr_xIn₈ heavy fermions. Physical Review B, 110(7): 075161, pp. 1-8. doi:10.1103/PhysRevB.110.075161.

Cite as: https://hdl.handle.net/21.11116/0000-000F-D384-D

Abstract

The higher dimensionality in the crystal fields of the Ce2MIn8 (M = Rh, Ir) compounds and its interplay with hybridization and disorder are key ingredients to understand the complex phase diagrams by this family, which have been explored extensively by macroscopic techniques. Here, we present an investigation of the crystalelectric field schemes of Ce2Rh1-xIrxIn8 using x-ray absorption spectroscopy. Our full multiplet calculations for the 4f(1) configuration of Ce3+ to describe the temperature-dependent linear dichroism in Ce2MIn8 are consistent with a Gamma(1)(7) = root/1 - alpha(2) center dot vertical bar -/+ 3/2 > - vertical bar center dot vertical bar +/- 5/2 > ground state containing a predominant d +/- 3/2) contribution that increases further with x. This enhancement is believed to favor superconductivity in Ce-based heavy fermion materials, observed in previous results in the CeMIn5 family. Our recent observations shed light on the unexpected emergence of the ambient-pressure superconducting dome in the center of the composition phase diagram and its subsequent suppression on the Ir-rich side due to the early onset of fluctuations associated with the structurally more disordered state, inferred from previous neutron magnetic diffraction experiments.