We have investigated the relation among ρ-T characteristics, superconductivity, annealing conditions and the crystallinity of polycrystalline (In 2 O 3 ) 1-x -(ZnO) x films. We annealed as-grown amorphous films in air by changing annealing temperature and time. It is found that the films annealed at 200 °C or 300 °C for a time over 0.5 h shows the superconductivity. Transition temperature T c and the carrier density n are T c < 3.3 K and n ≈ 10 25 -10 26 m -3 , respectively. Investigations for films with x = 0.01 annealed at 200 °C have revealed that the T c , n and crystallinity depend systematically on annealing time. Further, we consider that there is a suitable annealing time for sharp resistive transition because the transition width becomes wider with longer annealing times. We studied the upper critical magnetic field H c2 (T) for the film with different annealing time. From the slope of dH c2 /dT for all films, we have obtained the resistivity ρ dependence of the coherence length ξ(0) at T = 0 K.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering