First-Principles Study of the Electronic Structure of Heavy Fermion YbNi2

E, Yan; Wu, Bao-Ning

doi:10.1007/s10948-013-2368-0

Cited by 5 publications

(2 citation statements)

References 15 publications

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“…The competition between an antiferromagnetic interaction and the Kondo effect has been widely studied so far, while studies for the ferromagnetic case are still limited in number. The latter have so far been observed in the Yb compounds YbNi 4 P 2 [1,2], YbNi 2 [3,4], YbNiSn [5], YbNiGa [6], and YbCu 2 Si 2 [7]. The Ce compounds CeRu 1−xFexPO [8] and CeIrB 2 [9] display a ferromagnetic Kondo lattice and a ferromagnetic QCP, respectively.…”

Section: Introductionmentioning

confidence: 79%

“…The strongly correlated Yb 4f states are treated with the Hubbard-I approximation [47,48]. The local Coulomb interaction of the Yb 4f electrons is parameterized in terms of the Slater parameters F 0 , F 2 , F 4 , and F 6 . The Hubbard U parameter F 0 is heavily screened by the valence electrons and was set to 7.9 eV for YbPdSi and YbPtGe, and to 8.1 eV for YbPdGe.…”

Section: Dft + Dmft Calculationsmentioning

confidence: 99%

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Electronic structure of ferromagnetic heavy fermion, YbPdSi, YbPdGe, and YbPtGe studied by photoelectron spectroscopy, x-ray emission spectroscopy, and DFT + DMFT calculations

Yamaoka¹,

Thunström²,

Tsujii³

et al. 2017

J. Phys.: Condens. Matter

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Electronic structures of ferromagnetic heavy fermion Yb compounds of YbPdSi, YbPdGe, and YbPtGe are studied by photoelectron spectroscopy around the Yb 4d-4f resonance, resonant x-ray emission spectroscopy at the Yb L absorption edge, and density functional theory combined with dynamical mean field theory calculations. These compounds all have a temperature-independent intermediate Yb valence with large [Formula: see text] and small [Formula: see text] components. The magnitude of the Yb valence is evaluated to be YbPtGe [Formula: see text] YbPdGe [Formula: see text] YbPdSi, suggesting that YbPtGe is the closest to the quantum critical point among the three Yb compounds. Our results support the scenario of the coexistence of heavy fermion behavior and ferromagnetic ordering which is described by a magnetically-ordered Kondo lattice where the magnitude of the Kondo effect and the RKKY interaction are comparable.

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Section: Introductionmentioning

confidence: 79%

Section: Dft + Dmft Calculationsmentioning

confidence: 99%

Electronic structure of ferromagnetic heavy fermion, YbPdSi, YbPdGe, and YbPtGe studied by photoelectron spectroscopy, x-ray emission spectroscopy, and DFT + DMFT calculations

Yamaoka¹,

Thunström²,

Tsujii³

et al. 2017

J. Phys.: Condens. Matter

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Magnetic and Magnetoresistive Behavior of the Ferromagnetic Heavy Fermion YbNi2

Olicón

Escamilla

Conde-Gallardo

et al. 2018

J Supercond Nov Magn

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We present a study on the magnetic susceptibility χ(T ) and electrical resistance, as a function of temperature and magnetic field R(T, H), of the ferromagnetic heavy fermion YbNi 2 . The Xray diffraction analysis shows that the synthesized polycrystalline samples crystallizes in the cubic Laves phase structure C15, with a spatial group F d3m. The magnetic measurements indicate a ferromagnetic behavior with transition temperature at 9 K. The electrical resistance is metallic-like at high temperatures and no signature of Kondo effect was observed. In the ferromagnetic state, the electrical resistance can be justified by electron-magnon scattering considering the existence of an energy gap in the magnonic spectrum. The energy gap was determined for various applied magnetic fields. Magnetoresistance as a function of applied magnetic field, subtracted from the R(T, H) curves at several temperatures, is negative from 2 K until about 40 K for all applied magnetic fields. The negative magnetoresistance originates from the suppression of magnetic disorder by the magnetic field. 1 arXiv:1806.08881v1 [cond-mat.str-el]

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