溴插层石墨的超金属导电性
Supermetallic conductivity in bromine-intercalated graphite
摘要：
高度取向的热解石墨暴露于溴蒸气引起面内电荷电导率，其随着嵌入时间单调增加，朝向在低至5 K的温度下显著高于Cu的值（对于~6 at% Br）。磁输运，光学反射率和磁化率测量证实，溴掺杂的石墨烯片与孔，同时增加面间分离。迁移率（T=300 K时约为5E 4 cm^2/Vs）和电阻各向异性的增加以及插层样品的抗磁磁化率的降低表明，观察到的超金属导电性来自弱耦合空穴掺杂石墨烯片的平行组合。
英文摘要：
Exposure of highly oriented pyrolytic graphite to bromine vapor gives rise to in-plane charge conductivities which increase monotonically with intercalation time toward values (for ~6 at% Br) that are significantly higher than Cu at temperatures down to 5 K. Magnetotransport, optical reflectivity and magnetic susceptibility measurements confirm that the Br dopes the graphene sheets with holes while simultaneously increasing the interplanar separation. The increase of mobility (~ 5E4 cm^2/Vs at T=300 K) and resistance anisotropy together with the reduced diamagnetic susceptibility of the intercalated samples suggests that the observed supermetallic conductivity derives from a parallel combination of weakly-coupled hole-doped graphene sheets.
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