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Double peaks on ac magnetization in a superconducting Pb-porous glass nanocomposite |
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| Authors: | YS Ciou EV Charnaya DY Xing MK Lee |
| Institution: | a Department of Physics, National Cheng Kung University, Tainan 701, Taiwan b Center for Micro/Nano Science and Technology, National Cheng Kung University, Tainan 701, Taiwan c Institute of Physics, St. Petersburg State University, Petrodvorets, St. Petersburg 198904, Russia d National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, People's Republic of China e A.F. Ioffe Physico-Technical Institute RAS, St. Petersburg 194021, Russia |
| Abstract: | 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. |
| Keywords: | Pb-porous glass nanocomposite Superconductivity Ac magnetization Double peaks Phase transition in vortex system |
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