Absence of size dependence of the Kondo resistivity

Chandrasekhar, Venkat; Santhanam, P.; Penebre, N. A.; Webb, Richard A.; Vloeberghs, H.; Haesendonck, Chris Van; Bruynseraede, Y.

doi:10.1103/physrevlett.72.2053

Cited by 73 publications

(83 citation statements)

References 21 publications

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“…This behavior is observed in 2D Kondo films of AuFe at 1.4 and 4.2 K [3]. However, in another experiment on AuFe wires [4] with a much higher concentration of Fe impurities ͑ϳ50 ppm͒, temperature dependence of the MR was not studied. There are two important characteristics of our low temperature MR, different from the bulk Kondo behavior.…”

Section: Volume 84 Number 19 P H Y S I C a L R E V I E W L E T T E R Smentioning

confidence: 96%

“…The Kondo contribution to the resistivity Dr͑T ͒ is found to have the expected logarithmic increase [1]: Dr͑T ͒ A 2 B ln͑T ͒ (see Fig. 1), after the subtraction of the electron-electron interaction contribution [4] measured before the ion implantation, which has the expected theoretical value [8],…”

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confidence: 99%

“…The nature of this state and the extent of the screening cloud has been studied for decades. Recently this effect has been explored in mesoscopic systems in an attempt to understand whether the screening is affected by the finite sample size [2][3][4], including high temperature large-concentration experiments on layered Kondo systems [5], and 2D films [3,6]. Interference effects in mesoscopic Kondo systems containing impurity concentrations c .…”

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confidence: 99%

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Low Temperature Anomaly in Mesoscopic Kondo Wires

Mohanty

Webb

2000

Phys. Rev. Lett.

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We report the observation of an anomalous magnetoresistance in extremely dilute quasi-one-dimensional AuFe wires at low temperatures, along with a hysteretic background at low fields. The Kondo resistivity does not show the unitarity limit down to the lowest temperature, implying uncompensated spin states. We suggest that the anomalous magnetoresistance may be understood as the interference correction from the accumulation of geometric phase in the conduction electron wave function around the localized impurity spin.Comment: Four pages, five figure

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Section: Volume 84 Number 19 P H Y S I C a L R E V I E W L E T T E R Smentioning

confidence: 96%

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confidence: 99%

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confidence: 99%

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Low Temperature Anomaly in Mesoscopic Kondo Wires

Mohanty

Webb

2000

Phys. Rev. Lett.

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“…Extensive studies of this effect revealed that it is stronger for impurities with integer spin [29] and depends on surface roughness [30]. The effect was explained in terms of spin-orbit induced magnetic anisotropy for magnetic impurities in proximity to the film surface [31].…”

Section: Transport Properties Of Mo-ge-gd Filmsmentioning

confidence: 99%

Effect of magnetic Gd impurities on the superconducting state of amorphous Mo-Ge thin films with different thickness and morphology

et al. 2012

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We studied the effect of magnetic doping with Gd atoms on the superconducting properties of amorphous Mo70Ge30 films. We observed that in uniform films deposited on amorphous Ge, the pair-breaking strength per impurity strongly decreases with film thickness initially and saturates at a finite value in films with thickness below the spin-orbit scattering length. The variation is likely caused by surface-induced magnetic anisotropy and is consistent with the fermionic mechanism of superconductivity suppression. In thin films deposited on SiN the pair-breaking strength becomes zero. Possible reasons for this anomalous response are discussed. The morphological distinctions between the films of the two types were identified using atomic force microscopy with a carbon nanotube tip.

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“…This follows both from theoretical considerations 20 and experimental results. 22,23,25 However, a number of experimental observations were made on the size dependence of the Kondo effect, mostly using thin films or thin wires of very dilute Kondo alloys, e.g., AuFe 22,23,26 -28 or CuCr. 29,30 No clear picture emerges from these experimental results, since in some cases a size effect is indeed observed 22,26 -28,30 and in other cases not.…”

Section: A Size Dependence Of Single-impurity Kondo Scatteringmentioning

confidence: 99%

Thickness dependence of the ground-state properties of thin films of the heavy-fermion compoundCeCu6

et al. 2001

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High-quality thin polycrystalline films of the heavy-fermion compound CeCu 6 were prepared by sputter deposition. The thicker of these films ͑with thickness up to around 200 nm͒ reproduce the properties of the bulk compound CeCu 6 . As the thickness of the films is decreased, our measurements display strong deviations from the bulk properties, namely, a suppression of the heavy-fermion state. We show that possible ''external'' effects, such as disorder, oxidation and morphology can be excluded and that this size effect is therefore an intrinsic property of CeCu 6 . In addition, we investigate possible scenarios explaining the size effect, and find that the proximity of CeCu 6 to a quantum phase transition can account for this striking result.

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Absence of size dependence of the Kondo resistivity

Cited by 73 publications

References 21 publications

Low Temperature Anomaly in Mesoscopic Kondo Wires

Low Temperature Anomaly in Mesoscopic Kondo Wires

Effect of magnetic Gd impurities on the superconducting state of amorphous Mo-Ge thin films with different thickness and morphology

Thickness dependence of the ground-state properties of thin films of the heavy-fermion compoundCeCu6

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