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Switchable zero-bias anomaly in individual C60 molecules contacted with tunable aluminum electrodes
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10.1063/1.4795000
/content/aip/journal/ltp/39/3/10.1063/1.4795000
http://aip.metastore.ingenta.com/content/aip/journal/ltp/39/3/10.1063/1.4795000
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Top panel: Conductance histograms of an Al MCBJ (black) and Al MCBJ after deposition of 1 ML C 60 (red). Both histograms were calculated from closing curves measured at 10 K in UHV. Central and bottom panels: Selection of opening traces before and after deposition of 1 ML C60.

Image of FIG. 2.
FIG. 2.

(a) Differential conductance curves of an Al MCBJ after deposition of 0.5 ML C60 at 10 K for different measuring temperatures and after subtracting the temperature dependence of the off-resonance conductance G or. G or at the lowest measurement temperature was G or = 0.028 G 0. Inset: The same spectra at larger voltage scale showing the raw data before subtraction. (b) Peak conductance as a function of temperature and fit according to Eq. (3) yielding TK  = (63 ± 3) K. Inset: Effective Kondo temperatures TK ,eff (T) determined from the FWHM of the spectra shown in the top panel and linear extrapolation to T = 0 resulting in TK ,eff(0) = (65 ± 3) K.

Image of FIG. 3.
FIG. 3.

(a) Differential conductance curves of an Al MCBJ after deposition of 0.5 ML C60 at 10 K for different measuring temperatures showing a pronounced ZBA. Inset: Zoom onto the maximum. (b) Peak conductance as a function of temperature and fit according to Eq. (3) yielding TK  = (69.0 ±1.0) K. Inset: Kondo temperatures TK ,eff(T) determined from the FWHM of the spectra shown in the top panel and linear extrapolation to T = 0 resulting in TK ,eff(0) = (69.3 ±1.0) K.

Image of FIG. 4.
FIG. 4.

Differential conductance curves of an Al MCBJ after deposition of 0.5 ML C60 for different measuring temperatures showing a pronounced ZBA. Left inset: Effective Kondo temperatures TK ,eff (T) determined from the FWHM of the spectra shown in the main panel and linear extrapolation to T = 0 resulting in TK ,eff(0) = (57 ± 2) K. Right inset: Peak conductance as a function of temperature and fit according to Eq. (1) yielding TK  = (35 ± 5) K.

Image of FIG. 5.
FIG. 5.

Development of the ZBA as a function of distance when closing an Al MCBJ from the tunnel regime, measured at 9.3 K. Top panel: Selected spectra measured at distances marked in the lower panels with a symbol in the respective color. Central panel: Effective Kondo temperature TK ,eff deduced from the FWHM. Bottom: Corresponding closing trace: Symbols: off-resonance conductance G or for those spectra with ZBA, and average conductance G av for those junctions without ZBA; grey line: conductance measured at 0 mV.

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/content/aip/journal/ltp/39/3/10.1063/1.4795000
2013-03-27
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Switchable zero-bias anomaly in individual C60 molecules contacted with tunable aluminum electrodes
http://aip.metastore.ingenta.com/content/aip/journal/ltp/39/3/10.1063/1.4795000
10.1063/1.4795000
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