Magnetism and superconductivity in Sr2VFeAsO3 revealed by As-75- and V-51-NMR under elevated pressures

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	Magnetism and superconductivity in Sr2VFeAsO3 revealed by As-75- and V-51-NMR under elevated pressures
	Ueshima, K ; Han, F ; Zhu, XY ; Wen, HH ; Kawasaki, S ; Zheng, GQ
刊名	PHYSICAL REVIEW B
	2014
卷号	89 期号:18
ISSN号	1098-0121
通讯作者	Ueshima, K (reprint author), Okayama Univ, Dept Phys, Okayama 7008530, Japan.
中文摘要	We report As-75 and V-51 nuclear magnetic resonance (NMR) measurements on the iron-based superconductor Sr2VFeAsO3 with alternating stacks structure. We find that the As-75 nuclear spin-spin relaxation rate (1/T-2) shows a pronounced peak at T-N = 165 K, below which the resonance peak shifts to a higher frequency due to the onset of an internal magnetic field. The V-51 spectrum does not shift, but is broadened below T-N. We conclude that the Fe electrons order antiferromagnetically below T-N with a magnetic moment m(Fe) similar to 0.4 mu B. Application of external pressure up to 2.4 GPa reduces T-N at a rate of -40 K/GPa, and enhances the superconducting transition temperature T-c at a rate of 2 K/GPa. The pressure-temperature phase diagram for Sr2VFeAsO3 shows that superconductivity coexists with antiferromagnetism over a wide pressure range with an unprecedented high T-c up to 36.5 K.
资助信息	MEXT of Japan [22103004, 25400374]; MOST of China (973 Project) [2011CBA00100, 2012CB821402]
语种	英语
公开日期	2015-04-14
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/59541]
专题	物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文
推荐引用方式 GB/T 7714	Ueshima, K,Han, F,Zhu, XY,et al. Magnetism and superconductivity in Sr2VFeAsO3 revealed by As-75- and V-51-NMR under elevated pressures[J]. PHYSICAL REVIEW B,2014,89(18).
APA	Ueshima, K,Han, F,Zhu, XY,Wen, HH,Kawasaki, S,&Zheng, GQ.(2014).Magnetism and superconductivity in Sr2VFeAsO3 revealed by As-75- and V-51-NMR under elevated pressures.PHYSICAL REVIEW B,89(18).
MLA	Ueshima, K,et al."Magnetism and superconductivity in Sr2VFeAsO3 revealed by As-75- and V-51-NMR under elevated pressures".PHYSICAL REVIEW B 89.18(2014).