Spectroscopic evidence of Kondo-induced quasi-quartet in CeRh${}_2$As${}_2$

Abstract

CeRh${}_2$As${}_2$ is a new multiphase superconductor with strong suggestions for an additional itinerant multipolar ordered phase. The modeling of the low temperature properties of this heavy fermion compound requires a quartet Ce${}^{3+}$ crystal-field ground state. Here we provide the evidence for the formation of such a quartet state using x-ray spectroscopy. Core-level photoelectron and x-ray absorption spectroscopy confirm the presence of Kondo hybridization in CeRh${}_2$As${}_2$. The temperature dependence of the linear dichroism unambiguously reveils the impact of Kondo physics for coupling the Kramer's doublets into an effective quasi-quartet. Non-resonant inelastic x-ray scattering data find that the $|{\Gamma }_7^{-}⟩$ state with its lobes along the 110 direction of the tetragonal structure ($xy$ orientation) contributes most to the multi-orbital ground state of CeRh${}_2$As${}_2$.

8 pages, 7 figures

References in corpus (17)

• High multipole transitions in NIXS: valence and hybridization in 4f systems
• Possible quadrupole density wave in the superconducting Kondo lattice CeRh2As2
• Determining the crystal-field ground state in rare earth Heavy Fermion materials using soft-x-ray absorption spectroscopy
• Observation of antiferromagnetic order as odd-parity multipoles inside the superconducting phase in CeRh${}_2$As${}_2$
• Non-symmorphic symmetry and field-driven odd-parity pairing in CeRh${}_2$As${}_2$
• Field-angle dependence reveals odd-parity superconductivity in CeRh${}_2$As${}_2$
• Determining the in-plane orientation of the ground-state orbital of CeCu2Si2
• Even-odd parity transition in strongly correlated locally noncentrosymmetric superconductors : An application to CeRh${}_2$As${}_2$
• Triplet pairing mechanisms from Hund's-Kondo models: applications to UTe${}_2$ and CeRh${}_2$As${}_2$
• Superconductivity in disordered locally noncentrosymmetric materials: an application to CeRh${}_2$As${}_2$
• Violation of the Pauli-Clogston limit in a heavy Fermion superconductor CeRh${}_2$As${}_2$ --Duality of itinerant and localized 4f electrons--
• Decoupling multi-phase superconductivity from normal state ordering in CeRh${}_2$As${}_2$
• Anisotropic magnetotransport properties of the heavy-fermion superconductor CeRh${}_2$As${}_2$
• The quartet ground state in CeB${}_6$: an inelastic x-ray scattering study
• Multiple superconducting phases in heavy-fermion metals
• Orientation of ground-state orbital in CeCoIn${}_5$ and CeRhIn${}_5$
• Conventional type-II superconductivity in locally non-centrosymmetric LaRh${}_2$As${}_2$ single crystals

Cited by in corpus (17)

• Coexistence of near-EF flat band and van Hove singularity in a two-phase superconductor
• Fermi Surface Nesting with Heavy Quasiparticles in the Locally Noncentrosymmetric Superconductor CeRh${}_2$As${}_2$
• Hidden orders in spin-orbit entangled correlated insulators
• Coexistence of local magnetism and superconductivity in the heavy-fermion CeRh${}_2$As${}_2$ revealed by $\mu$SR studies
• Pressure-tuned quantum criticality in the locally non-centrosymmetric superconductor CeRh${}_2$As${}_2$
• Anisotropic magnetic and quadrupolar H-T phase diagram of CeRh2As2
• Origin of the non-Fermi-liquid behavior in CeRh2As2
• Appearance of $c$-axis magnetic moment in odd-parity antiferromagnetic state in CeRh${}_2$As${}_2$ revealed by ${}^{75}$As-NMR
• Field-induced superconductivity mediated by odd-parity multipole fluctuation
• The phase diagram of CeRh${}_2$As${}_2$ for out-of-plane magnetic field
• Superconducting meron phase in locally noncentrosymmetric superconductors
• Thermodynamics, elastic anomalies and excitations in the field induced phases of CeRh2As2
• The Kondo effect in ferromagnetic quantum critical CeRh${}_6$Ge${}_4$
• Distinct effect of Kondo physics on crystal field splitting in electron and spin spectroscopies
• La substitution studies on the heavy-fermion superconductor CeRh${}_2$As${}_2$
• Quantum geometric magnetic monopole and two-phase superconductivity in CeRh${}_2$As${}_2$
• Multipolar fluctuations from localized 4f electrons in CeRh2As2