Single-Ion Kondo Scaling of the Coherent Fermi Liquid Regime in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>Ce</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi>La</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mi>Ni</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Ge</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>

Pikul, Adam; Stockert, U.; Steppke, Alexander; Cichorek, T.; Hartmann, Stefanie; Caroca‐Canales, N.; Oeschler, N.; Brando, M.; Geibel, C.; Steglich, F.

doi:10.1103/physrevlett.108.066405

Cited by 35 publications

(33 citation statements)

References 26 publications

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“…2. Such a concurrence of T K and T coh has already been stated for CeCu 2 Si 2 [17] as well as the isostructural HF metals YbRh 2 Si 2 [18] and CeNi 2 Ge 2 [19]. For comparison, we also present results on the nonmagnetic reference compound LaCu 2 Si 2 .…”

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confidence: 76%

“…In conclusion, we showed that the enhanced TEP as well as the Nernst coefficient of the [19]. Our results indicate the Nernst effect to be a promising probe for directly detecting asymmetric scattering processes in correlated-electron systems and, therefore, to play an important role in exploring unconventional thermoelectric materials for potential applications.…”

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confidence: 54%

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Nernst Effect: Evidence of Local Kondo Scattering in Heavy Fermions

Sun

Steglich

2013

Phys. Rev. Lett.

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A distinctly temperature-dependent Nernst coefficient, ν, which is strongly enhanced over that of LaCu(2)Si(2), is observed between T=2 and 300 K for CeCu(2)Si(2) and Ce(0.8)La(0.2)Cu(2)Si(2). The enhanced ν(T) is determined by the asymmetry of the on-site Kondo (conduction electron -4f electron) scattering rate. Taking into account the measured Hall mobility, μ(H), the highly unusual thermopower, S, of these systems can be semiquantitatively described by S(T)=-ν(T)/μ(H)(T), which explicitly demonstrates that the thermopower originates from the local Kondo scattering process over a wide temperature range from far above to well below the coherence temperature (≈20 K for CeCu(2)Si(2)). Our results suggest that the Nernst effect can act as a proper probe of local charge-carrier scattering. This promises to impact on exploring the unconventional enhancement of the thermopower in correlated materials suited for potential applications.

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confidence: 76%

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confidence: 54%

Nernst Effect: Evidence of Local Kondo Scattering in Heavy Fermions

Sun

Steglich

2013

Phys. Rev. Lett.

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“…29 Owing to the absence of magnetism in the Ni sublattice, the Ce-Ni-based compounds have shown great advantage in studying the Ce-4f -electron correlation. 14,33,37,38 This also accounts to the fact that the CaBe 2 Ge 2 -type CeNi 2 As 2 is a nonmagnetic Kondo lattice because the Kondo coupling is largely enhanced by one of the inverted NiAs layer. Compared with all these cases, the ThCr 2 Si 2 -type CeNi 2 As 2 has a relatively small Kondo coupling but a moderately strong magnetic frustration.…”

Section: Resultsmentioning

confidence: 95%

Magnetism and crystalline electric field effect in ThCr2Si2-type CeNi2As
Luo
¹
,
Bao
²
,
Shen
³

et al. 2012
Phys. Rev. B

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A millimeter-sized ThCr 2 Si 2 -type CeNi 2 As 2 single crystal was synthesized by the NaAs flux method and its physical properties were investigated by magnetization, transport, and specific-heat measurements. In contrast to the previously reported CaBe 2 Ge 2 -type CeNi 2 As 2 , the ThCr 2 Si 2 -type CeNi 2 As 2 is a highly anisotropic uniaxial antiferromagnet with the transition temperature T N = 4.8 K. A magnetic-field-induced spin-flop transition was seen below T N when the applied B is parallel to the c axis, the magnetic easy axis, together with a huge frustration parameter f = θ W /T N . A pronounced Schottky-type anomaly in specific heat was also found around 160 K, which could be attributed to the crystalline electric field effect with the excitation energies being fitted to 1 = 325 K and 2 = 520 K, respectively. Moreover, the in-plane resistivity anisotropy and low-temperature x-ray diffractions suggest that this compound is a rare example exhibiting a possible structure distortion induced by the 4f -electron magnetic frustration.

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“…It can be described in terms of the Schotte-Schotte model [19]. It was argued before that such model applies even in a Kondo lattice regime: [20]. The second, broad peak is located roughly at 22 K. According to our knowledge, it is related to crystal field effects, described by the modified Schottky formula [21].…”

Section: Specific Heatmentioning

confidence: 86%

Kondo lattice behavior observed in the CeCu9In2 compound

Kurleto

Szytuła

Goraus

et al. 2019

Journal of Alloys and Compounds

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We report systematic studies of CeCu 9 In 2 , which appears to be a new Kondo lattice system. Electrical resistivity exhibits a logarithmic law characteristic of Kondo systems with a broad maximum at T coh ≈45 K and it obeys the Fermi liquid theory at low temperature. Specific heat of CeCu 9 In 2 is well described by the Einstein and Debye models with electronic part at high temperature. Fitting of the Schottky formula to low temperature 4f contribution to specific heat yielded crystal field splitting of 50.2 K between a doublet and quasi-quartet. The Schotte-Schotte model estimates roughly Kondo temperature as T K ≈5 K, but does not reproduce well the data due to a sharp peak at 1.6 K. This structure should be attributed to a phase transition, a nature of which is possibly antiferromagnetic. Specific heat is characterized with increased Sommerfeld coefficient estimated as γ ≈132 mJ/(mole·K 2 ). Spectra of the valence band, which have been collected with ultraviolet photoelectron spectroscopy (UPS), show a peak at binding energy≈250 meV, which originates from the Ce 4f electrons and is related to the 4f 1 7/2 final state. Extracted 4f contribution to the spectral function exhibits also the enhancement of intensity in the vicinity of the Fermi level. Satellite structure of the Ce 3d levels spectra measured by X-ray photoelectron spectroscopy (XPS) has been analyzed within the framework of the Gunnarsson-Schönhammer theory. Theoretical calculations based on density functional theory (FPLO method with LDA+U approach) delivered densities of states, band structures and Fermi surfaces for CeCu 9 In 2 and LaCu 9 In 2 . The results indicate that Fermi surface nesting takes place in CeCu 9 In 2 .

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Single-Ion Kondo Scaling of the Coherent Fermi Liquid Regime inCe1−xLaxNi2Ge2

Cited by 35 publications

References 26 publications

Nernst Effect: Evidence of Local Kondo Scattering in Heavy Fermions

Nernst Effect: Evidence of Local Kondo Scattering in Heavy Fermions

Magnetism and crystalline electric field effect in ThCr2Si2-type CeNi2As
Luo
¹
,
Bao
²
,
Shen
³

et al. 2012
Phys. Rev. B

Kondo lattice behavior observed in the CeCu9In2 compound

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Single-Ion Kondo Scaling of the Coherent Fermi Liquid Regime inCe1−xLaxNi2Ge2

Cited by 35 publications

References 26 publications

Nernst Effect: Evidence of Local Kondo Scattering in Heavy Fermions

Nernst Effect: Evidence of Local Kondo Scattering in Heavy Fermions

Magnetism and crystalline electric field effect in ThCr2Si2-type CeNi2AsLuo1, Bao2, Shen3 et al. 2012Phys. Rev. B

Kondo lattice behavior observed in the CeCu9In2 compound

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About

Magnetism and crystalline electric field effect in ThCr2Si2-type CeNi2As
Luo
¹
,
Bao
²
,
Shen
³

et al. 2012
Phys. Rev. B