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• W2091947774 endingPage "3687" @default.
• W2091947774 startingPage "3660" @default.
• W2091947774 abstract "A comprehensive study of the energy, temperature, and magnetic field dependence of the anomalous Kondo and spin-flip conductances ${G}^{(3)}(V)$ and ${G}^{(2)}(V)$, in vacuum-cleaved metal-semiconductor tunnel junctions is reported. Localized Anderson magnetic moments are characteristic of Schottky barriers at donor concentrations a few times the Mott critical concentration ${N}_{c}$. These moments, coupled to the conduction electrons in the semiconductor by the $sensuremath{-}d$ exchange interaction $ensuremath{-}2Jstackrel{ensuremath{rightarrow}}{mathrm{S}}ifmmodecdotelsetextperiodcenteredfi{}stackrel{ensuremath{rightarrow}}{ensuremath{sigma}}$, are lightly screened neutral donors at the inner edge of the depletion region. The background conductance in vacuum-cleaved junctions on Si: (1.6ifmmodetimeselsetexttimesfi{}${10}^{19}$ ${mathrm{cm}}^{ensuremath{-}3}$ donors) agrees satisfactorily with the parabolic barrier model, extended to the thin-barrier limit. A detailed study shows the energy dependence of the zero-bias Kondo scattering peak ${G}^{(3)}(V)$ to be in good agreement with the third-order perturbation theory of Kondo and Appelbaum. High magnetic field studies confirm that a large negative $g$ shift $ensuremath{Delta}g=2J{ensuremath{rho}}_{F}ensuremath{sim}ensuremath{-}1.0$ and related broadening $ensuremath{Gamma}=ensuremath{pi}{(J{ensuremath{rho}}_{F})}^{2}g{ensuremath{mu}}_{B}H$ of the Zeeman transition of the local moment occur via the exchange interaction. The broadening $ensuremath{Gamma}$ additionally produces, for $ensuremath{Gamma}ensuremath{gg}{k}_{B}T$, a quenching of the Kondo scattering peak from $ensuremath{-}logT$ to $ensuremath{-}log(frac{ensuremath{Gamma}}{{k}_{B}})$. The directly measured parameters $J{ensuremath{rho}}_{F}$ and ${E}_{0}$ determine a divergence temperature ${T}_{K}=(frac{{E}_{0}}{{k}_{B}})ifmmodetimeselsetexttimesfi{}mathrm{exp}(frac{1}{J{ensuremath{rho}}_{F}})=(2ifmmodepmelsetextpmfi{}1)$ ifmmode^circelsetextdegreefi{}K, significantly higher than an upper bound ensuremath{sim}0.5 ifmmode^circelsetextdegreefi{}K, indicated by the observed accurate $logT$ dependence of ${G}^{(3)}(0)$ to 0.4 ifmmode^circelsetextdegreefi{}K. The discrepancy is removed by assuming simultaneous potential and exchange scattering in a ratio determined via Appelbaum's theory from the observed ratio $frac{{G}^{(3)}}{{G}^{(2)}}$. In summary, the tunneling spectra and an extended Kondo-Appelbaum perturbation theory, including the implied $g$ shift, broadening $ensuremath{Gamma}$, and an added potential scattering, are in good agreement." @default.
• W2091947774 created "2016-06-24" @default.
• W2091947774 creator A5040600026 @default.
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• W2091947774 date "1970-11-01" @default.
• W2091947774 modified "2023-09-25" @default.
• W2091947774 title "Spectroscopy of Kondo and Spin-Flip Scattering: High-Field Tunneling Studies of Schottky-Barrier Junctions" @default.
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• W2091947774 doi "https://doi.org/10.1103/physrevb.2.3660" @default.
• W2091947774 hasPublicationYear "1970" @default.
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