Electronic Structures of Ferromagnetic CeAgSb${}_2$:Soft X-ray Absorption, Magnetic Circular Dichroism and Angle-Resolved Photoemission Spectroscopies

Abstract

We report a combined study for the electronic structures of ferromagnetic CeAgSb${}_2$ using soft X-ray absorption (XAS), magnetic circular dichroism (XMCD), and angle-resolved photoemission (ARPES) spectroscopies. The Ce $M_{4,5}$ XAS spectra show very small satellite structures, reflecting a strongly localized character of the Ce $4f$ electrons. The linear dichroism effects in the Ce $M_{4,5}$ XAS spectra demonstrate the ground state Ce $4f$ symmetry of $\Gamma {}_6$, the spatial distribution of which is directed along the $c$-axis. The XMCD results give support to the picture of local-moment magnetism in CeAgSb${}_2$. Moreover it is also found that the theoretical band dispersions for LaAgSb${}_2$ provides better description of the ARPES band structures than those for CeAgSb${}_2$. Nevertheless, ARPES spectra at the Ce $3d$-$4f$ resonance show the momentum dependence for the intensity ratio between Ce $4f_{5/2}^1$ and $4f_{7/2}^1$ peaks in a part of the Brillouin zone, suggesting the non-negligible momentum dependent hybridization effect between the Ce $4f$ and the conduction electrons. This is associated with the moderate mass enhancement in CeAgSb${}_2$.

arXiv commentto be published in Journal of the Physical Society of Japan

References in corpus (8)

• Superconducting phases of f-electron compounds
• Crystal-field and Kondo scale investigation of CeMIn5 (M=Co, Ir and Rh): a combined x-ray absorption and inelastic neutron study
• Correlation between the phase diagram and the crystal-field wave functions of CeRh(1-x)Ir(x)In5
• Determining the crystal-field ground state in rare earth Heavy Fermion materials using soft-x-ray absorption spectroscopy
• Electronic structures of CeRu${}_2{X}_2$ ($X$ = Si, Ge) in the paramagnetic phase studied by soft X-ray ARPES and hard X-ray photoelectron spectroscopy
• Wave-vector dependent intensity variations of the Kondo peak in photoemission from CePd${}_3$
• Fermi Surface Properties, Metamgnetic Transition and Quantum Phase Transition of CeRu${}_2$Si${}_2$ and Its Alloys Probed by the dHvA Effect--Fermi Surface Studies on the Itinerant and Localized Dichotomy of $f$ Electron Nature
• Kondo effect in Ce(x)La(1-x)Cu(2.05)Si(2) intermetallics

Cited by in corpus (1)

• Magnetic field-induced softening of spin waves and hard-axis order in Kondo-lattice ferromagnet CeAgSb${}_2$