研究目的
Investigating the finite bias evolution of the bosonic insulating phase and zero bias conductance in boron-doped diamond to understand the charge-Kondo effect.
研究成果
The observed re-entrant resistance peak and zero bias conductance peak in boron-doped diamond are interpreted as evidence of a charge-Kondo effect, with hole dopants acting as degenerate Kondo impurities. The T^2 dependence of resistance upturn and scaling behaviors support this interpretation, highlighting the role of carrier correlations in anomalous transport features.
研究不足
Assumptions in modeling, such as constant charging energy and analogies to Josephson junction arrays, may introduce deviations. The study is limited to specific BNCD samples and may not generalize to all boron-doped diamond systems.
1：Experimental Design and Method Selection:
The study involves systematic measurements of resistance and differential conductance in boron-doped nanocrystalline diamond films under varying bias currents and magnetic fields to investigate the charge-Kondo effect. Theoretical models including Kondo scattering and Josephson junction arrays are employed.
2：Sample Selection and Data Sources:
BNCD samples (B1, B
3：5, B4, B5) were grown using microwave plasma enhanced chemical vapor deposition on quartz substrates with different CH4/H2 ratios and constant TMB:
CH4 ratio. Samples have granular morphology with grain sizes from 20-100 nm.
4：List of Experimental Equipment and Materials:
Four-probe van der Pauw geometry setup for resistance measurements, equipment for voltage-current characteristics and differential conductance measurements, magnetic field application setup.
5：Experimental Procedures and Operational Workflow:
Resistance measurements (RXX and RXY) were performed, V-I characteristics and dI/dV were studied at different temperatures, bias currents, and magnetic fields. Data was collected and analyzed for scaling behaviors.
6：Data Analysis Methods:
Data fitting with equations for Kondo temperature (eq. 1), Josephson coupling energy (eq. 3), and FWHM analysis (eq. 4). Power law scaling and temperature dependencies were evaluated.
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