Electronic structure of the heavy-fermion caged compound<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mtext>Ce</mml:mtext><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mtext>Pd</mml:mtext><mml:mn>20</mml:mn></mml:msub><mml:msub><mml:mi>X</mml:mi><mml:mn>6</mml:mn></mml:msub><mml:mspace width="4pt" /><mml:mrow><mml:mo>(</mml:mo><mml:mi>X</mml:mi><mml:mo>=</mml:mo><mml:mtext>Si,</mml:mtext><mml:mspace width="4.pt" /><mml:mtext>Ge</mml:mtext><mml:mo>)</mml:mo></mml:mrow></mml

Yamaoka, H.; Schwier, Eike F.; Arita, Masashi; Shimada, Kenya; Tsujii, Naohito; Jarrige, Ignace; Jiang, Jian; Hayashi, Hirokazu; Iwasawa, Hideaki; Namatame, H.; Takeuchi, Masaki; Kitazawa, Hideaki

doi:10.1103/physrevb.91.115139

Cited by 6 publications

(12 citation statements)

References 44 publications

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“…17 (a)] having a Γ 8 ground state with a Γ 7 excited state some 3.9 meV above this [176,177], whilst the 4a fcc lattice cerium ions seem to possess a Γ 7 ground state [174,178,179]. Interestingly enough, when taking into account the lack of contribution of the fcc lattice, the magnetic environment of Ce 3 Pd 20 Si 6 echoes that of CeB 6 [176,179], and Goto et al have noted that with the inter-site distance of the simple cubic lattice being larger in Ce 3 Pd 20 Si 6 than for CeB 6 , one might expect the inter-site coupling to be correspondingly weaker, which may account for the reduced temperature scales in this material.…”

Section: Ce X Prmentioning

confidence: 99%

Multipolar phases and magnetically hidden order: review of the heavy-fermion compound Ce_1−xLa_xB₆

2016

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Cerium hexaboride is a cubic f-electron heavy-fermion compound that displays a rich array of low-temperature magnetic ordering phenomena which have been the subject of investigation for more than 50 years. Its complex behaviour is the result of competing interactions, with both itinerant and local electrons playing important roles. Investigating this material has proven to be a substantial challenge, in particular because of the appearance of a 'magnetically hidden order' phase, which remained elusive to neutron-scattering investigations for many years. It was not until the development of modern x-ray scattering techniques that the long suspected multipolar origin of this phase was confirmed. Doping with non-magnetic lanthanum dilutes the magnetic cerium sublattice and reduces the f-electron count, bringing about substantial changes to the ground state with the emergence of new phases and quantum critical phenomena. To this day, Ce1-x La x B6 and its related compounds remain a subject of intense interest. Despite the substantial progress in understanding their behaviour, they continue to reveal new and unexplained physical phenomena. Here we present a review of the accumulated body of knowledge on this family of materials in order to provide a firm standpoint for future investigations.

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Section: Ce X Prmentioning

confidence: 99%

Multipolar phases and magnetically hidden order: review of the heavy-fermion compound Ce_1−xLa_xB₆

2016

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“…Such an effect was observed, for example, by transport measurements in the prototypical QCP system YbRh 2 (Si 1−x Ge x ) 2 at the critical field of the lowtemperature antiferromagnetic (AFM) phase [1, 2]. Recently, the list of QCP materials was extended with the cubic Kondo lattice compound Ce 3 Pd 20 Si 6 [3][4][5], whose magnetic phase diagram comprises an antiferroquadrupolar (AFQ) phase below T Q = 0.5 K and an AFM phase at even lower temperatures. For the latter phase, a field-induced QCP was observed at the critical field B * = 0.9 T and the concomitant FS reconstruction was related to the destruction of the Kondo effect [3].…”

mentioning

confidence: 99%

Magnetic field and doping dependence of low-energy spin fluctuations in the antiferroquadrupolar compoundCe1−xLaxB6

et al. 2015

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CeB 6 is a model compound exhibiting antiferroquadrupolar (AFQ) order, its magnetic properties being typically interpreted within localized models. More recently, the observation of strong and sharp magnetic exciton modes forming in its antiferromagnetic (AFM) state at both ferromagnetic and AFQ wave vectors suggested a significant contribution of itinerant electrons to the spin dynamics. Here we investigate the evolution of the AFQ excitation upon the application of an external magnetic field and the substitution of Ce with non-magnetic La, both parameters known to suppress the AFM phase. We find that the exciton energy decreases proportionally to T N upon doping. In field, its intensity is suppressed, while its energy remains constant. Its disappearance above the critical field of the AFM phase is preceded by the formation of two modes, whose energies grow linearly with magnetic field upon entering the AFQ phase. These findings suggest a crossover from itinerant to localized spin dynamics between the two phases, the coupling to heavy-fermion quasiparticles being crucial for a comprehensive description of the magnon spectrum.PACS numbers: 75.30. Mb, 75.30.Ds, 78.70.Nx A current focus of research in heavy fermion (HF) compounds is the study of quantum critical points (QCP) -phase transitions achieved at zero temperature by tuning an external parameter such as magnetic field, doping, or pressure. One possible signature of a QCP is the change of the quasiparticle character from localized to itinerant, when the transition is connected with a breakdown of the Kondo effect and the removal of f-electrons from the Fermi surface (FS). Such an effect was observed, for example, by transport measurements in the prototypical QCP system YbRh 2 (Si 1−x Ge x ) 2 at the critical field of the lowtemperature antiferromagnetic (AFM) phase [1, 2]. Recently, the list of QCP materials was extended with the cubic Kondo lattice compound Ce 3 Pd 20 Si 6 [3][4][5], whose magnetic phase diagram comprises an antiferroquadrupolar (AFQ) phase below T Q = 0.5 K and an AFM phase at even lower temperatures. For the latter phase, a field-induced QCP was observed at the critical field B * = 0.9 T and the concomitant FS reconstruction was related to the destruction of the Kondo effect [3].CeB 6 was one of the first known AFQ compounds, where the multipolar order was observed both indirectly as an anomaly in specific heat at T Q = 3.2 K [6] and directly by resonant x-ray diffraction [7] or neutron diffraction [8, 9] as a weak magnetic Bragg peak centered at the Q AFQ = R(

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“…A thorough understanding of local site symmetry is essential for spectral data interpretation, and we will now discus it for each Pd site. The results clearly indicate that the lattice contribution is negligible in the resulting EFG tensor and that the effect of local polarization of p-orbitals in Si [30] is the dominant cause of the V xx ≈ 0 value.…”

Section: Local Site Symmetriesmentioning

confidence: 86%

“…We employed DFT to calculate the EFG tensor. Similar calculations were previously used to analyze photoelectron spectroscopy results of this system [30].…”

Section: A Dft Calculationmentioning

confidence: 92%

$^{105}$Pd NMR and NQR study of the cubic heavy fermion system Ce$_3$Pd$_{20}$Si$_6$

Jakovac,

Horvatić,

Schwier

et al. 2019

Preprint

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We report 105 Pd NMR and NQR measurements on a single crystal of Ce 3 Pd 20 Si 6 , where antiferroquadrupolar and antiferromagnetic orders develop at low temperature. From the analysis of NQR and NMR spectra, we have determined the electric field gradient (EFG) tensors and the anisotropic Knight shift (K) components for both inequivalent Pd sites -Pd(32f ) and Pd(48h).The observed EFG values are in excellent agreement with our state-of-the-art DFT calculations.The principal values of the quadrupolar coupling are (20.37 ± 0.02) MHz and (5.45 ± 0.02) MHz, for the Pd(32f ) and Pd(48h) site, respectively, which is large compared to the Larmor frequency defined by the gyromagnetic constant γ = 1.94838 MHz/T for 105 Pd. Therefore, the complete knowledge of K and the EFG tensors is crucial to establish the correspondence between NMR spectra and crystallographic sites, which is needed for a complete analysis of the magnetic structure, static spin susceptibility, and the spin-lattice relaxation rate data and a better understanding of the groundstate of Ce 3 Pd 20 Si 6 .

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Electronic structure of the heavy-fermion caged compoundCe3Pd20X6(X=Si,Ge)

Cited by 6 publications

References 44 publications

Multipolar phases and magnetically hidden order: review of the heavy-fermion compound Ce_1−xLa_xB₆

Multipolar phases and magnetically hidden order: review of the heavy-fermion compound Ce_1−xLa_xB₆

Magnetic field and doping dependence of low-energy spin fluctuations in the antiferroquadrupolar compoundCe1−xLaxB6

$^{105}$Pd NMR and NQR study of the cubic heavy fermion system Ce$_3$Pd$_{20}$Si$_6$

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Electronic structure of the heavy-fermion caged compoundCe3Pd20X6(X=Si,Ge)

Cited by 6 publications

References 44 publications

Multipolar phases and magnetically hidden order: review of the heavy-fermion compound Ce1−xLaxB6

Multipolar phases and magnetically hidden order: review of the heavy-fermion compound Ce1−xLaxB6

Magnetic field and doping dependence of low-energy spin fluctuations in the antiferroquadrupolar compoundCe1−xLaxB6

$^{105}$Pd NMR and NQR study of the cubic heavy fermion system Ce$_3$Pd$_{20}$Si$_6$

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Multipolar phases and magnetically hidden order: review of the heavy-fermion compound Ce_1−xLa_xB₆

Multipolar phases and magnetically hidden order: review of the heavy-fermion compound Ce_1−xLa_xB₆