Spatial development of superconductivity in the Sr2RuO4-Ru eutectic system

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

6 pages, 6 figures, accepted for publication in J. Phys. Soc. Jpn

References in corpus (8)

• Observation of Andreev Surface Bound States in the 3-K phase Region of Sr_2RuO_4
• Superconducting Double Transition and the Upper Critical Field Limit of Sr2RuO4 in Parallel Magnetic Fields
• Phenomenological theory of the 3 Kelvin phase in Sr2RuO4
• Interface superconductivity in the eutectic Sr2RuO4-Ru: 3-K phase of Sr2RuO4
• Anomalous Transport through the p-Wave Superconducting Channel in the 3-K Phase of Sr2RuO4
• Tunneling properties at the interface between superconducting Sr2RuO4 and a Ru micro-inclusion
• Superconductivity in Sr2RuO4-Sr3Ru2O7 eutectic crystals
• Multiple superconducting transitions in the Sr3Ru2O7 region of Sr3Ru2O7-Sr2RuO4 eutectic crystals

Cited by in corpus (9)

• Evaluation of Spin-Triplet Superconductivity in Sr2RuO4
• Strong Peak in $T_c$ of Sr${}_2$RuO${}_4$ Under Uniaxial Pressure
• Higher-Tc superconducting phase in Sr2RuO4 induced by uniaxial pressure
• Higher-Tc Superconducting Phase in Sr2RuO4 Induced by In-Plane Uniaxial Pressure
• Topological competition of superconductivity in Pb/Ru/Sr_2RuO_4 junctions
• Superconductivity in the nonsymmorphic line-nodal compound CaSb${}_2$
• Anisotropic uniaxial pressure response of the Mott insulator Ca2RuO4
• Large Enhancement of 3-K Phase Superconductivity in the Sr2RuO4-Ru Eutectic System by Uniaxial Pressure
• Evening out the spin and charge parity to increase T${}_c$ in unconventional superconductor Sr_{2}RuO_{4}