Coexistence of ferromagnetism and superconductivity in YBCO nanoparticles

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	Coexistence of ferromagnetism and superconductivity in YBCO nanoparticles
	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
	2012
卷号	14 期号:11 页码:3859-3863
关键词	PARTICLE-SIZE MAGNETISM FIELDS STATE UGE2
ISSN号	1463-9076
通讯作者	Xue, DS (reprint author), Lanzhou Univ, MOE, Key Lab Magnetism & Magnet Mat, Lanzhou 730000, 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.
学科主题	Physics
收录类别	SCI
资助信息	National Science Fund for Distinguished Young Scholars [50925103]; Chinese ministry of Education [309027]; National Natural Science Foundation of China [11034004]
原文出处	http://dx.doi.org/10.1039/c2cp23046a
语种	英语
WOS记录号	WOS:000300572800016
公开日期	2014-04-25
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/15194]
专题	理论物理研究所_理论物理所1978-2010年知识产出
推荐引用方式 GB/T 7714	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.
APA	Zhu, ZH.,Gao, DQ.,Dong, CH.,Yang, GJ.,Zhang, J.,...&Xue, DS.(2012).Coexistence of ferromagnetism and superconductivity in YBCO nanoparticles.PHYSICAL CHEMISTRY CHEMICAL PHYSICS,14(11),3859-3863.
MLA	Zhu, ZH,et al."Coexistence of ferromagnetism and superconductivity in YBCO nanoparticles".PHYSICAL CHEMISTRY CHEMICAL PHYSICS 14.11(2012):3859-3863.