Temperature- and field-dependent leakage current of Pt/(Ba0.7Sr0.3)TiO3 interface

Abstract

Pt/(Ba 0.7 Sr 0.3 ) TiO 3 ( BST)/YBa 2 Cu 3 O 7− x (YBCO ) capacitors on SrTiO3 substrates were fabricated. The temperature and field dependence of the leakage current of Pt/BST interface were studied in the temperature range from 100 K to 320 K and in an electric field up to 3 MV/cm. For a middle electric field (<1 MV/cm), the leakage current shows space-charge-limited-current behavior in the temperature range from 100 K to 200 K. In the case of a high electric field (>1.8 MV/cm), the leakage mechanism is governed by the Fowler–Nordheim tunneling in the whole measured temperature range.