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题名: Coexistence of ferromagnetism and superconductivity in YBCO nanoparticles
作者: Zhu, ZH ;  Gao, DQ ;  Dong, CH ;  Yang, GJ ;  Zhang, J ;  Zhang, JL ;  Shi, ZH ;  Gao, H ;  Luo, HG ;  Xue, DS
刊名: PHYSICAL CHEMISTRY CHEMICAL PHYSICS
出版日期: 2012
卷号: 14, 期号:11, 页码:3859-3863
关键词: PARTICLE-SIZE ;  MAGNETISM ;  FIELDS ;  STATE ;  UGE2
学科分类: Physics
通讯作者: Xue, DS (reprint author), Lanzhou Univ, MOE, Key Lab Magnetism & Magnet Mat, Lanzhou 730000, Peoples R China.
部门归属: [Zhu, Zhonghua; Gao, Daqiang; Dong, Chunhui; Yang, Guijin; Zhang, Jing; Zhang, Jinlin; Shi, Zhenhua; Gao, Hua; Luo, Honggang; Xue, Desheng] Lanzhou Univ, MOE, Key Lab Magnetism & Magnet Mat, Lanzhou 730000, Peoples R China; [Luo, Honggang] Lanzhou Univ, Ctr Interdisciplinary Studies, Lanzhou 730000, Peoples R China; [Luo, Honggang] Chinese Acad Sci, Inst Theoret Phys, Key Lab Frontiers Theoret Phys, Beijing 100190, Peoples R China
英文摘要: Nanoparticles of superconducting YBa2Cu3O7-delta were synthesized via a citrate pyrolysis technique. Room temperature ferromagnetism was revealed in the samples by a vibrating sample magnetometer. Electron spin resonance spectra at selected temperatures indicated that there is a transition from the normal to the superconducting state at temperatures below 100 K. The M-T curves with various applied magnetic fields showed that the superconducting transition temperatures are 92 K and 55 K for the air-annealed and the post-annealed samples, respectively. Compared to the air-annealed sample, the saturation magnetization of the sample by reheating the air-annealed one in argon atmosphere is enhanced but its superconductivity is weakened, which implies that the ferromagnetism maybe originates from the surface oxygen defects. By superconducting quantum interference device measurements, we further confirmed the ferromagnetic behavior at high temperatures and interesting upturns in field cooling magnetization curves within the superconducting region are found. We attributed the upturn phenomena to the coexistence of ferromagnetism and superconductivity at low temperatures. Room temperature ferromagnetism of superconducting YBa2Cu3O7-delta nanoparticles has been observed in some previous related studies, but the issue of the coexistence of ferromagnetism and superconductivity within the superconducting region is still unclear. In the present work, it will be addressed in detail. The cooperation phenomena found in the spin-singlet superconductors will help us to understand the nature of superconductivity and ferromagnetism in more depth.
资助者: National Science Fund for Distinguished Young Scholars [50925103]; Chinese ministry of Education [309027]; National Natural Science Foundation of China [11034004]
收录类别: SCI
原文出处: 查看原文
语种: 英语
WOS记录号: WOS:000300572800016
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/15194
Appears in Collections:理论物理所2012年知识产出_期刊论文

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Recommended Citation:
Zhu, ZH,Gao, DQ,Dong, CH,et al. Coexistence of ferromagnetism and superconductivity in YBCO nanoparticles[J]. PHYSICAL CHEMISTRY CHEMICAL PHYSICS,2012,14(11):3859-3863.
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