Direct observation of heavy quasiparticles in the Kondo-lattice compound CeIn3

Abstract

The electronic structure of the Kondo lattice CeIn3 has been studied by on-resonant angle-resolved photoemission spectroscopy and scanning tunneling microscopy/spectroscopy. A weakly dispersive quasiparticle band has been observed directly with an energy dispersion of 4 meV by photoemission, implying the existence of weak hybridization between the f electrons and conduction electrons. The hybridization is further confirmed by the formation of the hybridization gap revealed by temperature-dependent scanning tunneling spectroscopy. Moreover, we find the hybridization strength in CeIn3 is much weaker than that in the more two-dimensional compounds CeCoIn5 and CeIrIn5. Our results may be essential for the complete microscopic understanding of this important compound and the related heavy-fermion systems.

Crystal electric field splitting and f -electron hybridization in heavy-fermion CePt2In7

“…This has been suggested, too, by quantum oscillation measurements [19]. The hybridization between f 1 5/2 electron and conduction bands also has been reported in other Ce-based heavy fermions [13,14,[29][30][31]39]. As shown in Fig.…”

“…1(b). A high-intensity, nondispersive structure at around −2.5 eV corresponds to the f 0 final state [12][13][14][28][29][30]. Weak heavy quasiparticle bands…”

“…')"45, close to E F correspond to the f 1 final state. These lowenergy peaks originate from the spin-orbit splitting of the f 1 final state [12][13][14][28][29][30][31]. The f 1 5/2 final state is located near E F .…”

Electronic structure and 4f -electron character in Ce2PdIn8 studied by angle-resolved photoemission spectroscopy

“…Moreover, as shown in Fig. 5(b), a heavy quasiparticle band is induced with an energy dispersion of around 6 meV, which is larger than that in CeIn 3 [18,33], indicating a stronger hybridization in CeIn 3 . To summarize, we have characterized the electronic structure and f electron behavior of Ce 2 PdIn 8 using highresolution resonant and non-resonant ARPES.…”

The 4f-Hybridization Strength in Ce m Mn In3m+2n Heavy-Fermion Compounds Studied by Angle-Resolved Photoemission Spectroscopy

“…[4] In previous ARPES experiments, a weak heavy quasiparticle band with an energy dispersion of 4 meV was observed, indicating a weak 𝑐-𝑓 hybridization. [17] Ce 2 IrIn 8 is a tetragonal compound. The observation of a spin-glass state, [41] a relatively high Sommerfeld coefficient (∼700 mJ•mol −1 •K −2 ), [30] and the absence of long-range magnetic order indicate that the Ce 4𝑓 electrons in Ce 2 IrIn 8 have itinerant character.…”