Coherent Kondo State in a Dense Kondo Substance: CexLa1-xCu6

Sumiyama, Akihiko; Oda, Yasukage; Nagano, Hiroshi; Ōnuki, Yoshichika; Shibutani, Kazuyuki; Komatsubara, T.

doi:10.1143/jpsj.55.1294

Cited by 175 publications

(64 citation statements)

References 24 publications

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“…Generally, in heavy-fermion materials, isovalent substitution of magnetic ions with non-magnetic ones leads to a crossover from a coherent Kondo lattice to the dilute Kondo impurity regime, as it was shown for Ce 1−x La x Cu 6 [53][54][55][56]. Lanthanum doping of CeB 6 suppresses both AFM and AFQ phases and induces a new multipolar-ordered phase IV beyond a quantum critical point (QCP) at x ≈ 0.3, presumably of octupolar character [57][58][59].…”

Section: Introductionmentioning

confidence: 85%

Doping-induced redistribution of magnetic spectral weight in the substituted hexaborides Ce1−xLaxB6 and
Nikitin
¹
,
Portnichenko
²
,
Dukhnenko
³

et al. 2018
Phys. Rev. B
12
3
16
0
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We investigate the doping-induced changes in the electronic structure of CeB 6 on a series of substituted Ce 1−x R x B 6 samples (R = La, Nd) using diffuse neutron scattering. We observe a redistribution of magnetic spectral weight across the Brillouin zone, which we associate with the changes in the Fermi-surface nesting properties related to the modified charge carrier concentration. In particular, a strong diffuse peak at the corner of the Brillouin zone (R point), which coincides with the propagation vector of the elusive antiferroquadrupolar (AFQ) order in CeB 6 , is rapidly suppressed by both La and Nd doping, like the AFQ order itself. The corresponding spectral weight is transferred to the X (00 1 2 ) point, ultimately stabilizing a long-range AFM order at this wave vector at the Nd-rich side of the phase diagram. At an intermediate Nd concentration, a broad diffuse peak with multiple local maxima of intensity is observed around the X point, evidencing itinerant frustration that gives rise to multiple ordered phases for which Ce 1−x Nd x B 6 is known. On the La-rich side of the phase diagram, however, dilution of the magnetic moments prevents the formation of a similar (00 1 2 )-type order despite the presence of nesting. Our results demonstrate how diffuse neutron scattering can be used to probe the nesting vectors in complex f-electron systems directly, without reference to the single-particle band structure, and emphasize the role of Fermi surface geometry in stabilizing magnetic order in rare-earth hexaborides.

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Section: Introductionmentioning

confidence: 85%

Doping-induced redistribution of magnetic spectral weight in the substituted hexaborides Ce1−xLaxB6 and
Nikitin
¹
,
Portnichenko
²
,
Dukhnenko
³

et al. 2018
Phys. Rev. B
12
3
16
0
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“…For example, in Ce x La 1−x Cu 6 , it is reported that LaCu 6 evolves to CeCu 6 without magnetic order and the residual resistivity has a maximum around x = 0.5. 60 The difference from the Ce x La 1−x Ru 2 Si 2 system may come from the following fact. The crystal structure of LaCu 6 is monoclinic, while that of CeCu 6 is orthorhombic at room temperature.…”

Section: Magnetic Phase Diagrams Of Cerumentioning

confidence: 99%

Fermi Surface Properties, Metamagnetic Transition and Quantum Phase Transition of CeRu₂Si₂ and Its Alloys Probed by the dHvA Effect

2014

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This article describes the Fermi surface properties of CeRu 2 Si 2 and its alloy systems CeRu 2 (Si x Ge 1−x ) 2 and Ce x La 1−x Ru 2 Si 2 studied by the de Haas -van Alphen (dHvA) effect. We pay particular attention to how the Fermi surface properties and the f electron state change with magnetic properties, in particular how they change associated with metamagnetic transition and quantum phase transition. After summarizing the

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“…The electron-magnon coupling ͉g k ជ͉ 2 for ferromagnetic system is independent 35 of k ជ . In the limit of ប k ជ /2k B T ӷ 1, the leading term of electron-magnon resistivity in the anisotropic ferromagnetic material FM can be written as…”

Section: Appendix A: Ferromagnetic Casementioning

confidence: 99%

Magnetization and electrical-transport investigation of the dense Kondo systemCeAgSb2

et al. 2005

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Of the dense Kondo materials in the class CeTSb 2 ͑where T = Au, Ag, Ni, Cu, or Pd͒, CeAgSb 2 is special due to its complex magnetic ground state, which exhibits both ferromagnetic and antiferromagnetic character below an ordering temperature T O ϳ 9.8 K. To further elucidate a description of this magnetic ground state, we have carried out a systematic study of single crystalline CeAgSb 2 by magnetic, electrical magneto-transport, and Shubnikov-de Haas ͑SdH͒ studies. We have constructed the magnetic phase diagram based solely on magnetoresistance data. Here, depending on the orientation of the magnetic field H, either ferromagnetic or antiferromagnetic ordering occurs below T O . At zero field the temperature-dependent resistivity below T O is most consistent with antiferromagnetic order, based on the transport theory which includes magnon scattering. The crystal-field-effect theory applied to the susceptibility data yields splitting energies from the ground state to the first and second excited states of 53 K and 137 K, respectively. Based on different models to determine the Kondo temperature T K , we can obtain both low-temperature and high-temperature estimates for T K of ϳ23 K and ϳ65 K, respectively. In the Fermi surface studies, the measurements show very small Fermi surface sections, not predicted by band-structure calculations, and the SdH amplitudes are very sensitive to field direction.

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Coherent Kondo State in a Dense Kondo Substance: Ce_xLa_1-xCu₆

Cited by 175 publications

References 24 publications

Doping-induced redistribution of magnetic spectral weight in the substituted hexaborides Ce1−xLaxB6 and
Nikitin
¹
,
Portnichenko
²
,
Dukhnenko
³

et al. 2018
Phys. Rev. B
12
3
16
0
View full text Add to dashboard Cite

Doping-induced redistribution of magnetic spectral weight in the substituted hexaborides Ce1−xLaxB6 and
Nikitin
¹
,
Portnichenko
²
,
Dukhnenko
³

et al. 2018
Phys. Rev. B
12
3
16
0
View full text Add to dashboard Cite

Fermi Surface Properties, Metamagnetic Transition and Quantum Phase Transition of CeRu₂Si₂ and Its Alloys Probed by the dHvA Effect

Magnetization and electrical-transport investigation of the dense Kondo systemCeAgSb2

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Coherent Kondo State in a Dense Kondo Substance: CexLa1-xCu6

Cited by 175 publications

References 24 publications

Doping-induced redistribution of magnetic spectral weight in the substituted hexaborides Ce1−xLaxB6 and Nikitin1, Portnichenko2, Dukhnenko3 et al. 2018Phys. Rev. B123160View full textAdd to dashboardCite

Doping-induced redistribution of magnetic spectral weight in the substituted hexaborides Ce1−xLaxB6 and Nikitin1, Portnichenko2, Dukhnenko3 et al. 2018Phys. Rev. B123160View full textAdd to dashboardCite

Fermi Surface Properties, Metamagnetic Transition and Quantum Phase Transition of CeRu2Si2 and Its Alloys Probed by the dHvA Effect

Magnetization and electrical-transport investigation of the dense Kondo systemCeAgSb2

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About

Coherent Kondo State in a Dense Kondo Substance: Ce_xLa_1-xCu₆

Doping-induced redistribution of magnetic spectral weight in the substituted hexaborides Ce1−xLaxB6 and
Nikitin
¹
,
Portnichenko
²
,
Dukhnenko
³

et al. 2018
Phys. Rev. B
12
3
16
0
View full text Add to dashboard Cite

Doping-induced redistribution of magnetic spectral weight in the substituted hexaborides Ce1−xLaxB6 and
Nikitin
¹
,
Portnichenko
²
,
Dukhnenko
³

et al. 2018
Phys. Rev. B
12
3
16
0
View full text Add to dashboard Cite

Fermi Surface Properties, Metamagnetic Transition and Quantum Phase Transition of CeRu₂Si₂ and Its Alloys Probed by the dHvA Effect