Electrical Conduction in Ensembles of Tunneling-Coupled Fine Particles of Tin. : I. Thermally-Activated Tunneling

概要

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Fine particles of Sn mutually coupled by tunneling through oxide are fabricated, in which average particle sizes and the interparticle coupling can be separately controlled. The temperature dependence of the zero-bias resistance, R, of this system is given by R=R_o exp √<T_o/T> in both the normal and the superconductiog states, where R_o is a constant. Another constant T_o depends on the particle size but does not on the interparticle coupling. This behavior is explained in terms of thermally-activated tunneling in a bundle of linear chains of particles by taking into account a particle-size distribution. The superconducting transition temperature and the transition width increase as the particle size decreases and/or the interparticle coupling becomes weak. Some possible origins are proposed for these effects.
社団法人日本物理学会の論文
1976-09-15