Spatial Development of Superconductivity in the Sr<SUB>2</SUB>RuO<SUB>4</SUB>–Ru Eutectic System

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  • Kittaka Shunichiro
    Department of Physics, Graduate School of Science, Kyoto University
  • Nakamura Taketomo
    Department of Physics, Graduate School of Science, Kyoto University
  • Yaguchi Hiroshi
    Department of Physics, Graduate School of Science, Kyoto University Department of Physics, Faculty of Science and Technology, Tokyo University of Science
  • Yonezawa Shingo
    Department of Physics, Graduate School of Science, Kyoto University
  • Maeno Yoshiteru
    Department of Physics, Graduate School of Science, Kyoto University

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  • Spatial development of superconductivity in the Sr2RuO4-Ru eutectic system

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Abstract

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 response to ac and dc magnetic fields are explained by the formation of the Josephson network consisting of inter-lamellar supercurrents.

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