The magnetoconductance was investigated for the superconductor YBa2(Cu0.9Fe0.1)3Oy (Fe10) at various temperatures above Tc and for the non-superconductor YBa2(Cu0.85Fe0.15)3Oy (Fe15) below 4.2 K. In Fe10 the magnetoconductance is negative above 211 K, while it is positive below 70 K where the temperature coefficient of the resistivity (TCR) is negative. The positive magnetoconductance observed in Fe10 shows a H2 dependence at lower magnetic fields. In Fe15 the magnetoconductance is negative at lower magnetic fields and turns to positive at higher magnetic fields of more than 2-3 T, and a H2 dependence is not observed. These types of behavior can be explained by a two-dimensional Anderson localization occuring at the CuO2 plane.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering