Wang, Lei, Qi, Yanpeng, Wang, Dongliang, Zhang, Xianping, Gao, Zhaoshun, Zhang, Zhiyu, ...
We report significant transport critical currents firstly achieved in Sr0.6K0.4Fe2As2 wires and tapes with a Tc = 34 K, which were fabricated through an in-situ powder-in-tube process. Silver was...
Ma, Yanwei, Gao, Zhaoshun, Qi, Yanpeng, Zhang, Xianping, Wang, Lei, Zhang, Zhiyu, ...
The recent discovery of superconductivity in the iron based superconductors with very high upper critical fields presents a new possibility for practical applications, but fabricating fine-wire is a...
Superconductivity in SmFe1-xMxAsO (M = Co, Rh, Ir) (2009)
Qi, Yanpeng, Wang, Lei, Gao, Zhaoshun, Wang, Dongliang, Zhang, Xianping, Zhang, Zhiyu, ...
In this paper we report the comparative study of superconductivity by 3d (Co), 4d (Rh), 5d (Ir) element doping in SmFeAsO. X-ray diffraction patterns indicate that the material has formed the...
Wang, Lei, Qi, Yanpeng, Zhang, Xianping, Gao, Zhaoshun, Wang, Dongliang, Ma, Yanwei
Effects of Ag addition (5-20 wt%) on the superconducting properties of polycrystalline Sr0.6K0.4FeAs have been studied. Critical zero resistance transition Tc, Hirr and Jc were significantly enhanced...
Superconductivity in Ir-doped LaFe1-xIrxAsO (2009)
Qi, Yanpeng, Wang, Lei, Gao, Zhaoshun, Wang, Dongliang, Zhang, Xianping, Zhang, Zhiyu, ...
We report the realization of superconductivity by 5d element Ir doping in LaFeAsO, a prototype parent compound of high-temperature iron based superconductors. X-ray diffraction patterns indicate that...
Superconductivity induced by doping Ru in SrFe2-xRuxAs2 (2009)
Qi, Yanpeng, Wang, Lei, Gao, Zhaoshun, Wang, Dongliang, Zhang, Xianping, Ma, Yanwei
Using one-step solid state reaction method, we have successfully synthesized the superconductor SrFe1-xRuxAs. X-ray diffraction indicates that the material has formed the ThCr2Si2-type structure with...
Superconductivity of powder-in-tube Sr0.6K0.4Fe2As2 wires (2009)
Qi, Yanpeng, Zhang, Xianping, Gao, Zhaoshun, Zhang, Zhiyu, Wang, Lei, Wang, Dongliang, ...
Nb-sheathed Sr0.6K0.4Fe2As2 superconducting wires have been fabricated using the powder-in-tube (PIT) method for the first time and the superconducting properties of the wires have been investigated....
Structural and critical current properties in polycrystalline SmO1-xFxFeAs (2008)
Wang, Lei, Gao, Zhaoshun, Qi, Yanpeng, Zhang, Xianping, Wang, Dongliang, Ma, Yanwei
A series of polycrystalline SmO1-xFxFeAs bulks (x=0.15, 0.2, 0.3 and 0.4) were prepared by the conventional solid state reaction. Resistivity, susceptibility, magnetic hysteresis, critical current...
Superconductivity in Co-doped SmFeAsO (2008)
Qi, Yanpeng, Gao, Zhaoshun, Wang, Lei, Wang, Dongliang, Zhang, Xianping, Ma, Yanwei
Here we report the synthesis and basic characterization of SmFe1-xCoxAsO (x=0.10, 0.15). The parent compound SmFeAsO itself is not superconducting but shows an antiferromagnetic order near 150 K,...
Superconductivity at 34.7 K in the iron arsenide Eu0.7Na0.3Fe2As2 (2008)
Qi, Yanpeng, Gao, Zhaoshun, Wang, Lei, Wang, Dongliang, Zhang, Xianping, Ma, Yanwei
EuFe2As2 is a member of the ternary iron arsenide family. Similar to BaFe2As2 and SrFe2As2, EuFe2As2 exhibits a clear anomaly in resistivity near 200 K. It suggests that EuFe2As2 is another promising...
A cheap liquid additive from acetone for strong in-field Jc enhancement in MgB2 conductors (2008)
Wang, Dongliang, Ma, Yanwei, Gao, Zhaoshun, Zhang, Xianping, Wang, Lei, Awaji, S., ...
We report on significant flux pinning enhancement in MgB2/Fe tapes that has been easily obtained by a simple and cheap route using acetone as both an efficient ball-milling medium and liquid additive...
Ma, Yanwei, Gao, Zhaoshun, Wang, Lei, Qi, Yanpeng, Wang, Dongliang, Zhang, Xianping
A safe, simple and easily scaleable one-step sintering method is proposed to fabricate newly discovered superconductors of SmO1-xFxFeAs. Superconducting transition with the onset temperature of 54.6...
Gao, Zhaoshun, Wang, Lei, Qi, Yanpeng, Wang, Dongliang, Zhang, Xianping, Ma, Yanwei, ...
We demonstrate that Ta sheathed SmO1-xFxFeAs wires were successfully fabricated by the powder-in-tube (PIT) method for the first time. Structural analysis by mean of x-ray diffraction shows that the...
Strongly Enhanced Current-Carrying Performance in MgB2 Tape Conductors by Novel C60 Doping (2008)
Zhang, Xianping, Ma, Yanwei, Gao, Zhaoshun, Wang, Dongliang, Wang, Lei, Liu, Wei, ...
MgB2 is a promising superconductor for important large-scale applications for both high field magnets and cryocooler-cooled magnet operated at temperatures around 20 K. In this work, by utilizing C60...
Superconductivity of powder-in-tube LaO0.9F0.1FeAs wires (2008)
Gao, Zhaoshun, Wang, Lei, Qi, Yanpeng, Wang, Dongliang, Zhang, Xianping, Ma, Yanwei
We demonstrate that Fe sheathed LaO0.9F0.1FeAs wires with Ti as a buffer layer were successfully fabricated by the powder-in-tube (PIT) method. Comparing to the common two-step vacuum quartz tube...
Gao, Zhaoshun, Ma, Yanwei, Zhang, Xianping, Wang, Dongliang, Wang, Junhong, Watanabe, K., ...
A significant enhancement of Jc and Hirr in MgB2 tapes has been achieved by the in situ powder-in-tube method utilizing hollow carbon spheres (HCS) as dopants. At 4.2 K, the transport Jc for the 850C...
Wang, Dongliang, Ma, Yanwei, Yu, Zhengguang, Gao, Zhaoshun, Zhang, Xianping, Watanabe, K., ...
The effect of the quality of starting powders on the microstructure and superconducting properties of in-situ processed Fe-sheathed MgB2 tapes has been investigated. Three different types of...
Gao, Zhaoshun, Ma, Yanwei, Zhang, Xianping, Wang, Dongliang, Yu, Zhengguang, Watanabe, K., ...
Fe-sheathed MgB2 tapes with cheap stearic acid, Mg stearate and Zn stearate doping were prepared through the in situ powder-in-tube method. It is found that Jc, Hirr, and Hc2 were significantly...
Improved critical current densities in MgB2 tapes with ZrB2 doping (2006)
Zhang, Xianping, Gao, Zhaoshun, Wang, Dongliang, Yu, Zhengguang, Ma, Yanwei, Awaji, S., ...
MgB2/Fe tapes with 2.5-15 at.% ZrB2 additions were prepared through the in situ powder-in-tube method. Compared to the pure tape, a significant improvement in the in-field critical current density Jc...
Large irreversibility field in nanoscale C-doped MgB2/Fe tape conductors (2006)
Ma, Yanwei, Zhang, Xianping, Awaji, S., Gao, Zhaoshun, Wang, Dongliang, Yu, Zhengguang, ...
We investigated the effect of nanoscale-C doping on the critical current density Jc and irreversibility field Birr of Fe-sheathed MgB2 tapes prepared by the in-situ powder-in-tube method. The tapes...
Enhancement of JC-B Properties in MoSi2 doped MgB2 tapes (2006)
Zhang, Xianping, Ma, Yanwei, Gao, Zhaoshun, Yu, Zhengguang, Nishijima, G., Watanabe, K.
MoSi2 doped MgB2 tapes with different doping levels were prepared through the in-situ powder-in-tube method using Fe as the sheath material. Effect of MoSi2 doping on the MgB2/Fe tapes was...
Enhanced critical current density of MgB2 superconductor synthesized in high magnetic fields (2006)
Ma, Yanwei, Xu, Aixia, Zhang, Xianping, Li, Xiaohang, Awaji, S., Watanabe, K.
The effect of high magnetic fields on the current carrying properties of both MgB2 bulks and Fe-sheathed tapes was investigated following different thermal sequences. It is found that application of...
Ma, Yanwei, Zhang, Xianping, Nishijima, G., Watanabe, K., Bai, Xuedong
Nanocarbon-doped Fe-sheathed MgB2 tapes with different doping levels were prepared by the in situ powder-in-tube method. Compared to the undoped tapes, Jc for all the C-doped samples was enhanced by...
Effect of nano-C doping on the in-situ processed MgB2 tapes (2005)
Zhang, Xianping, Ma*, Yanwei, Xu, Aixia, Jiao, Yulei, Xiao, Ling, Awaji, S., ...
The effect of nano-C doping on the microstructure and superconducting properties of Fe-sheathed MgB2 tapes prepared through the in-situ powder-in-tube method was studied. Heat treatment was performed...
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