Studies of temperature dependences of ac magnetization were carried out for a superconducting lead-porous glass nanocomposite. Double peaks were found on the imaginary part of ac magnetization which were accompanied with double steps on the real part. The lower-temperature anomalies in ac magnetization differed noticeably when they were obtained upon cooling and warming. The double peaks were treated as two phase transitions in the vortex system: the liquid-solid transition which occurs close to the onset of superconductivity and solid-solid one which is triggered by superconductivity in confined lead islands.
|頁（從 - 到）||4942-4944|
|期刊||Physics Letters, Section A: General, Atomic and Solid State Physics|
|出版狀態||Published - 2010 十一月 1|
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)