Toward simple powers of T in the Kondo effect

Star, Wim; Basters, F.B.; Nap, G. M.; Vroede, E. de; Baarle, C. Van

doi:10.1016/0031-8914(72)90213-3

Cited by 47 publications

(3 citation statements)

References 38 publications

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“…For temperatures below ∼0.6 K, the resistivity of the underdoped samples clearly follows a T 2 temperature dependence (inset of Fig. 1d ), as expected for Kondo-like behavior [ 31 , 32 ]. The good agreement with the NRG, NCA and Hamann predictions proves exclusively the Kondo mechanism and leaves little room for alternative interpretation in the underdoped region, which also confirms that the local moment is roughly spin-1/2.…”

Section: Resultssupporting

confidence: 69%

Kondo scattering in underdoped Nd1−xSrxNiO2 infinite-layer superconducting thin films

Shao

Zhang

Qiao

et al. 2023

National Science Review

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The recent discovery of superconductivity in infinite-layer nickelates generates tremendous research endeavors, but the ground state of their parent compounds is still under debate. Here, we report experimental evidences for the dominant role of Kondo scattering in the underdoped Nd1-xSrxNiO2 thin films. A resistivity minimum associated with logarithmic temperature dependence in both longitudinal and Hall resistivities are observed in the underdoped Nd1-xSrxNiO2 samples before the superconducting transition. At lower temperatures down to 0.04 K, the resistivities become saturated, following the prediction of the Kondo model. A linear scaling behavior $\sigma _{{\boldsymbol{xy}}}^{{{\boldsymbol AHE}}}{\rm{\ }}\sim{\rm{\ }}{\sigma }_{{\boldsymbol{xx}}}$ between anomalous Hall conductivity $\sigma _{{\boldsymbol{xy}}}^{{\boldsymbol{AHE}}}$ and conductivity ${\sigma }_{{\boldsymbol{xx}}}{\rm{\ }}$is revealed, verifying the dominant Kondo scattering at low temperature. The effect of weak (anti-)localization is found to be secondary. Our experiments can help clarifying the basic physics in the underdoped Nd1-xSrxNiO2 infinite-layer thin films.

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Section: Resultssupporting

confidence: 69%

Kondo scattering in underdoped Nd1−xSrxNiO2 infinite-layer superconducting thin films

Shao

Zhang

Qiao

et al. 2023

National Science Review

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“…T h e above analysis shows that they break down below TK. The situation is even worse for the ground state models, where drastic deviations from experiment were found (Star et al 1972) ; the good agreement claimed by Heeger (1969) is caused by impurity interaction effects.…”

Section: Properties Of the Kondo Resonancementioning

confidence: 90%

Magnetic impurities in non-magnetic metals

1974

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I n this article the properties of 3d transition metal impurities in simple metal hosts are summarized.T h e microscopic models of Friedel, Anderson and Wolff are reviewed, and the question of the formation of the magnetic moment on the impurity is briefly discussed. The structure of the Anderson model in the Hartree-Fock approximation and the correlation effects in the weakly magnetic limit when the Coulomb correlation energy U is smaller than the width A of the d states are summarized, together with the perturbational treatments of the model in the strongly magnetic limit UiA $1.The s-d exchange model and the Kondo effect (the logarithmic increase of the resistivity with decreasing temperature) are discussed, and the various approximations of this model are compared. T h e relation between the Anderson model and the s-d exchange model is derived, and the nature of the Schrieffer-Wolff transformation is analysed, in particular the question of the polarization of the s and d states.The experimental state of affairs is reviewed next, and the experimental dataobtained mainly on alloys of noble metals and aluminium with 3d elements-are collected to answer the questions raised in the previous sections. Experimental evidence on the singlet ground state, on charge neutrality and on the single-particle and many-body resonances is summarized. The question of the validity of the various approximations of the models is answered by comparing the experimentally found behaviours with theoretically derived formulae; this comparison leads to an indication of the basic unresolved questions in this field.Finally, the latest developments in the theory are reviewed. These developments involve the consideration of the Kondo problem as a typical case of infrared divergencies, and are based on scaling and renormalization group techniques ; they may bridge the gap between the earlier theories and the experimental facts.

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“…In the logarithmic region of the resistivity curve (p a In T) annealing produced only small changes in the temperature dependence of the resistivity. Defining F as the logarithmic slope of the resistivity curve at 16 K, F=-(dp/d In T)I16K (1) annealing to 70 K did not change F within experimental error; annealing to 270 K produced at most a 20% increase in F (Table II). Sharma and Chari have reported qualitatively similar results on bulk Cu(Fe) alloys.m1…”

Section: Cu(fe) Filmsmentioning

confidence: 99%

Effect of annealing on the resistivity of quench-condensed Cu and Cu(Fe) thin films

Silvėrman

Briscoe

1978

J Low Temp Phys

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Pure Cu and Cu(Fe) thin films containing ~0.1 and ~1.0 at % Fe were prepared by low-temperature deposition onto a liquid-helium-cooled substrate. The Cu (Fe ) films were annealed sequentially at approximately 17, 70, and 270 K. After each annealing stage the resistivity was measured down to ~l.5 K. The Cu(Fe) films exhibited a region in which the resistivity was proportional to In T; in this region the logarithmic slope of the resistivity curve was only weakly affected by annealing. Below ~ 10 K annealing produced a significant decrease in the impurity (Fe) contribution to the resistivity. The results are interpreted as due to increased interactions between Fe atoms produced by an increase in conduction-electron mean free path.

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Toward simple powers of T in the Kondo effect

Cited by 47 publications

References 38 publications

Kondo scattering in underdoped Nd1−xSrxNiO2 infinite-layer superconducting thin films

Kondo scattering in underdoped Nd1−xSrxNiO2 infinite-layer superconducting thin films

Magnetic impurities in non-magnetic metals

Effect of annealing on the resistivity of quench-condensed Cu and Cu(Fe) thin films

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