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Journal Articles

Muon spin rotation study of magnetism in multilayer HgBa$$_2$$Ca$$_4$$Cu$$_5$$O$$_y$$ superconductor

Tokiwa, Kazuyasu*; Mikusu, Satoshi*; Higemoto, Wataru; Nishiyama, Kusuo*; Iyo, Akira*; Tanaka, Yasumoto*; Kotegawa, Hisashi*; Mukuda, Hidekazu*; Kitaoka, Yoshio*; Watanabe, Tsuneo*

Physica C, 460-462(2), p.892 - 895, 2007/09

https://doi.org/10.1016/j.physc.2007.03.187
 Times Cited Count：3 Percentile：17.83(Physics, Applied)

Zero- and longitudinal-field muon-spin rotation (ZF-$$mu$$SR and LF-$$mu$$SR) measurements were carried out on a multi-layered HgBa$$_2$$Ca$$_4$$Cu$$_5$$O$$_y$$ (Hg-1245) superconductor with $$T$$$$_{rm c}$$ of 108 K. With decreasing temperature, the observed ZF-$$mu$$SR function changed from a Gaussian-type to an exponential-type below 60 K and zero field muon precession was also observed below 45 K. These $$mu$$SR signals are attributed to the development of the antiferromagnetic ordering in inner CuO$$_2$$planes with a low carrier concentration. These results seem to indicate clear evidence that antiferromagnetism microscopically coexists with superconductivity in the Hg-1245 superconductor below 60 K.

Journal Articles

Vortex observation in Tl-based superconductors with a scanning SQUID microscopy

Okayasu, Satoru; Nishio, Taichiro*; Ono, Masao; Mashimo, Tsutomu; Tanaka, Yasumoto*; Iyo, Akira*

Physica C, 437-438, p.239 - 241, 2006/05

https://doi.org/10.1016/j.physc.2006.03.007
 Times Cited Count：3 Percentile：17.95(Physics, Applied)

Pinning properties of superconducting material Tl-1223 thin film are investigated. Vortex images are compared between a pristine and high-energy gold ion irradiated sample. This comparison implies which pinning center is effective for this material between large pinning centers and columnar defect. Large pinning centers are better for this material.

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