Tunneling Conductivity in the Normal Phase of Superconducting Indium in Porous Glass

Authors O.N. Ivanov , I.V. Sudzhanskaya

Belgorod State University, 85, Pobedy Str., 308015 Belgorod, Russia

Issue Volume 7, Year 2015, Number 2
Dates Received 13 May 2015; published online 10 June 2015
Citation O.N. Ivanov, I.V. Sudzhanskaya, J. Nano- Electron. Phys. 7 No 2, 02044 (2015)
PACS Number(s) 72.80Tm, 73.40Gk, 77.25. – q
Keywords Porous glass, Indium (7) , Superconducting transition, Tunneling conductivity.
Annotation Electrical resistance of indium in 7 nm-pore glass has been studied in the temperature 2.3-300 K interval. It was found that material under study undergoes the transition into the superconducting state at TC = 3.9 K. A sharp asymmetric R(T) maximum was found at temperature of 6.4 K. The R(T) dependence has been for the first time analyzed for the normal phase. It was found that the temperature dependence of the resistance in the temperature 15-80 K interval can be described by tunnelling mechanism of the charge carriers in the frames of the Sheng’s model. Material under study can be considered as electrically inhomogeneous material in which metallic domains in pores are contacting each other via dielectric bridges of glass matrix. A charge transfer between the metallic domains can be realized by the electron tunneling through the potential barriers corresponding to the dielectric bridges.

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