We report a systematic study of a large peak in the microwave losses near Tc in micron-size powders of high-Tc superconducting cuprates. It is demonstrated that the effect arises because all the grains do not have a single Tc. The onset of superconductivity in some particles enhances the RF field "seen" by their neighbors leading to a net increase in absorption. The temperature regime of enhanced loss spans the extrema of the transition temperatures.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering