Physics – Condensed Matter – Superconductivity
Scientific paper
2009-05-13
J. Phys. Soc. Jpn. 78, 064703 (2009).
Physics
Condensed Matter
Superconductivity
6 pages, 6 figures, accepted for publication in J. Phys. Soc. Jpn
Scientific paper
10.1143/JPSJ.78.064703
We have clarified how the enhanced superconductivity, often referred to as the 3-K phase superconductivity, develops in the Sr2RuO4-Ru eutectic system. From the detailed ac and dc susceptibility measurements on well-characterized crystals, we revealed strongly anisotropic shielding, governed by the direction of the screening current dominated within the RuO2 plane rather than by the orientation of the Ru lamellae. The onset temperature of the 3-K phase superconductivity probed by diamagnetic screening is as high as 3.5 K. The temperature dependence of the diamagnetic shielding above around 2 K is well ascribed by the interfacial screening around each Ru lamella. Below around 2 K, the rapid development of the shielding fraction as well as its peculiar esponse to ac and dc magnetic fields are explained by the formation of the Josephson network consisting of inter-lamellar supercurrents.
Kittaka Shunichiro
Maeno Yoshiteru
Nakamura Taketomo
Yaguchi Hiroshi
Yonezawa Shingo
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