Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1819308 | Physica C: Superconductivity and its Applications | 2009 | 6 Pages |
Abstract
We have prepared iron-oxypnictide SmFeAsO1âxFx by ambient-pressure technique and SmFeAsO1ây by high-pressure technique, and characterized their bulk and local magnetic properties by using SQUID magnetometer and magneto-optical imaging. While the high-pressure samples have densities close to the theoretical value, the ambient-pressure samples have several small voids. Despite these structural differences between the two kinds of samples, they both have superconducting transition temperature above 50Â K. In addition, magneto-optical images for both samples show similar kinds of inhomogeneities with large current concentrated in several grains and with small intergranular current. The estimated intragranular currents for both samples are over 105Â A/cm2 at low temperatures and low fields.
Related Topics
Physical Sciences and Engineering
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Condensed Matter Physics
Authors
T. Tamegai, Y. Nakajima, Y. Tsuchiya, A. Iyo, K. Miyazawa, P.M. Shirage, H. Kito, H. Eisaki,