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	Vortex–glass state in the isovalent optimally doped pnictide superconductor bafe2(as0.68p0.32)2
	Salem-Sugui,S1; Mosqueira,J2; Alvarenga,A D3; Só?ora,D2; Crisan,A4; Ionescu,A M4,5; Sundar,S1; Hu,D6; Li,S-L6; Luo,H-Q6
刊名	Superconductor science and technology
	2017-03-23
卷号	30期号:5
关键词	Superconductor pnictide Vortex–glass state Pinning activation energy Critical current 74.70.xa 74.25.ha 74.25.uv 74.25.wx
ISSN号	0953-2048
DOI	10.1088/1361-6668/aa62f1
英文摘要	Abstract we report on isochamp magneto-resistivity and ac susceptibility curves obtained in a high-quality single crystal of the isovalent optimally doped pnictide bafe2(as 0.68 p 0.32 )2 with superconducting temperature tc?=?27.8 k for h∥c-axis. plots of the logarithmic derivative of the resistivity curves allowed the identification of a vortex–glass (vg) phase and to obtain the values of the critical glass temperature tg, the temperature t* marking the transition to the liquid phase and of the critical exponent s. the presence of the vg phase is confirmed by detailed measurements of the third harmonic signal of the ac magnetic susceptibility. the modified vg model was successfully applied to the data allowing the obtention of the temperature independent vg activation energy ub. the activation energy u0 obtained from the arrhenius plots in the flux–flow region are compared with ub and with u0 obtained from flux–creep measurements on a m(h) isothermal in the same sample. a phase diagram of the studied sample is constructed showing the tg glass line, the t* line representing a transition (melting) to the liquid phase, the mean field temperature tc(h) line and the hp line obtained from the peaks in isothermal critical current, jc(h) curves, which are explained in terms of a softening of the vortex lattice. the glass line was fitted by a theory presented in the literature which considers the effect of disorder.
语种	英语
出版者	IOP Publishing
WOS记录号	IOP:0953-2048-30-5-AA62F1
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2373506
专题	物理研究所
作者单位	1.Instituto de Fisica, Universidade Federal do Rio de Janeiro, 21941-972 Rio de Janeiro, RJ, Brazil 2.LBTS, Universidade de Santiago de Compostela, E-15782, Spain 3.Instituto Nacional de Metrologia Qualidade e Tecnologia, 25250-020 Duque de Caxias, RJ, Brazil 4.National Institute of Materials Physics Bucharest, 405A Atomistilor Str., 077125 Magurele, Romania 5.Faculty of Physics, University of Bucharest, 077125 Bucharest-Magurele, Romania 6.Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People’s Republic of China
推荐引用方式 GB/T 7714	Salem-Sugui,S,Mosqueira,J,Alvarenga,A D,et al. Vortex–glass state in the isovalent optimally doped pnictide superconductor bafe2(as0.68p0.32)2[J]. Superconductor science and technology,2017,30(5).
APA	Salem-Sugui,S.,Mosqueira,J.,Alvarenga,A D.,Só?ora,D.,Crisan,A.,...&Luo,H-Q.(2017).Vortex–glass state in the isovalent optimally doped pnictide superconductor bafe2(as0.68p0.32)2.Superconductor science and technology,30(5).
MLA	Salem-Sugui,S,et al."Vortex–glass state in the isovalent optimally doped pnictide superconductor bafe2(as0.68p0.32)2".Superconductor science and technology 30.5(2017).

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