Kondo-hole conduction and magnetism of the lightly La-doped Kondo insulator CeRhSb

Ślebarski, A.; Spałek, J.; Fijałkowski, Marcin; Goraus, Jerzy; Cichorek, T.; Bochenek, Ł.

doi:10.1103/physrevb.82.235106

Cited by 11 publications

(11 citation statements)

References 41 publications

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“…These parameters solely enter the composition of d k,l h as can be seen in Eq. (13). Due to T iα k ∝ t iα only f -orbitals for which t ni is finite are involved and the relative amount of these individual orbitals is controlled by the strength of the coupling t ni /V i .…”

Section: Embedding the Supercell Analysis Into The Literaturementioning

confidence: 99%

“…Stable magnetic bound states induced by charge neutral substitution of single Ce by La are expected to exist in systems whose parent compound shows Kondo insulating behavior [18]. However, in experiments [11][12][13][15][16][17] with a finite hole concentration x these local bound states haven't been observed so far since long range interactions between the bound states, which are already present at the lowest experimentally accessible x (for example x = 0.006 in (Ce 1−x La x ) 3 Bi 4 Pt 3 [11]), lead to the formation of a very narrow Kondo-hole band in the hybridization gap.…”

Section: Viewpoint Onto the Kondo-hole Physics Puzzle In Ce1−xlaxpd3mentioning

confidence: 99%

“…The replacement of single magnetic atoms by their nonmagnetic counterparts in a charge neutral substitution is called creation of Kondo hole which gradually destroys the coherence of the heavy Fermion (HF) ground state and, consequently, results in new properties of the highly correlated material. In recent decades, the physics of Kondo holes has been of great interest for several experiments on heavy fermions [6][7][8][9][10][11][12][13]. Kondo holes in the metallic phase of the PAM in general leads to a continuous crossover from the coherent heavy Fermi liquid (FL) to the single impurity behavior [5,14].…”

Section: Introductionmentioning

confidence: 99%

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Kondo holes in strongly correlated impurity arrays: RKKY driven Kondo screening and hole-hole interactions

Eickhoff,

Anders

2021

Preprint

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Section: Embedding the Supercell Analysis Into The Literaturementioning

confidence: 99%

Section: Viewpoint Onto the Kondo-hole Physics Puzzle In Ce1−xlaxpd3mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Kondo holes in strongly correlated impurity arrays: RKKY driven Kondo screening and hole-hole interactions

Eickhoff,

Anders

2021

Preprint

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“…On the hybridization strength -total electron concentration, |V | -n plane, w f is significantly enlarged in the three distinct regimes, which we identify respectively as the mixed-valence, Kondo/almost Kondo insulating, and the Kondo-lattice regimes (when f -electron concentration is close to the half-filling, i.e., when n f → 1). These physically distinct regimes are frequently discussed and identified in various experiments 2,11,[62][63][64][65][66] and in theory 19,33,67,68 . The structure of the paper is as follows.…”

Section: Introductionmentioning

confidence: 99%

Gutzwiller wave-function solution for Anderson lattice model: Emerging universal regimes of heavy quasiparticle states

2015

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The recently proposed diagrammatic expansion (DE) technique for the full Gutzwiller wave function (GWF) is applied to the Anderson lattice model. This approach allows for a systematic evaluation of the expectation values with full Gutzwiller wave function in the finite dimensional systems. It introduces results extending in an essential manner those obtained by means of standard Gutzwiller approximation (GA) scheme which is variationally exact only in infinite dimensions. Within the DE-GWF approach we discuss principal paramagnetic properties and their relevance to the heavy fermion systems. We demonstrate the formation of an effective, narrow f -band originating from atomic f -electron states and subsequently interpret this behavior as a direct itineracy of f -electrons; it represents a combined effect of both the hybridization and the correlations reduced by the Coulomb repulsive interaction. Such feature is absent on the level of GA which is equivalent to the zeroth order of our expansion. Formation of the hybridization-and electron-concentrationdependent narrow f -band rationalizes common assumption of such dispersion of f levels in the phenomenological modeling of the band structure of CeCoIn5. Moreover, it is shown that the emerging f -electron direct itineracy leads in a natural manner to three physically distinct regimes within a single model, that are frequently discussed for 4f -or 5f -electron compounds as separate model situations. We identify these regimes as: (i) mixed-valence regime, (ii) Kondo-insulator border regime, and (iii) Kondo-lattice limit when the f -electron occupancy is very close to the f -states half-filling, n f → 1. The nonstandard features of emerging correlated quantum liquid state are stressed.

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“…The resistivity and susceptibility measurements show that the critical concentration x c between the Kondo insulator and the metallic state is 0.12 for the CeRhSb 1 À x Sn x series [7] and 0.06 for CeRh 1 À x Pd x Sb series [8]. For Ce 1 À x La x RhSb the gap is quenched when the La concentration is 0.05-0.1 [9] or 0.02-0.04 [10]. This discrepancy could be probably attributed to sample preparation process, the existence of ferromagnetic clusters was postulated in the latter report.…”

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confidence: 99%

Quantum critical transition from Kondo insulator to metallic state studied by band‐structure calculations for doped compounds: CeRhSb and CeNiSn

Goraus

Ślebarski

2013

Physica Status Solidi (b)

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We present the ab initio calculations of the on‐site hybridization between Ce 4f and Ce 5d electrons as well as the Mulliken Ce 5d occupation for the doped Kondo insulators CeRhSb and CeNiSn. In our investigations we have examined the following series: CeRhSb1 − xSnx, CeRh1 − xPdxSb, CeRhSb1 − xTex, Ce1 − xLaxRhSb and CeNi1 − xCuxSn, CeNiSn1 − xSbxSb, Ce1 − xLaxNiSn. The transition from the Kondo insulator to the metallic state induced by doping at some critical concentration xc was recently reported for various dopants based on the resistivity, susceptibility and spectroscopic data. Our calculations show that both the Mulliken occupation of Ce 5d states and the onsite hybridization between Ce 4f and Ce 5d states exhibit critical behavior at nearly the same dopant concentrations as observed in experiment. We also note that for the CeRhSb‐based alloys the disorder is not necessary to explain their critical behavior, in contrast to the CeNiSn‐based series.

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Kondo-hole conduction and magnetism of the lightly La-doped Kondo insulator CeRhSb

Cited by 11 publications

References 41 publications

Kondo holes in strongly correlated impurity arrays: RKKY driven Kondo screening and hole-hole interactions

Kondo holes in strongly correlated impurity arrays: RKKY driven Kondo screening and hole-hole interactions

Gutzwiller wave-function solution for Anderson lattice model: Emerging universal regimes of heavy quasiparticle states

Quantum critical transition from Kondo insulator to metallic state studied by band‐structure calculations for doped compounds: CeRhSb and CeNiSn

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