Annealing effect on the superconductivity of In 2 O 3 -ZnO thin films

B. Shinozaki, N. Kokubo, K. Makise, S. Takada, T. Yamaguti, S. Ogura, Kazumasa Yamada, K. Yano, K. Terai, S. Tomai, H. Nakamura

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2 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)956-959
Number of pages4
JournalPhysica C: Superconductivity and its applications
Volume469
Issue number15-20
DOIs
Publication statusPublished - Oct 15 2009

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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    Shinozaki, B., Kokubo, N., Makise, K., Takada, S., Yamaguti, T., Ogura, S., Yamada, K., Yano, K., Terai, K., Tomai, S., & Nakamura, H. (2009). Annealing effect on the superconductivity of In 2 O 3 -ZnO thin films Physica C: Superconductivity and its applications, 469(15-20), 956-959. https://doi.org/10.1016/j.physc.2009.05.115