Faculté des sciences

Phase Transition in the 3-Kelvin Phase of Eutectic Sr₂RuO₄–Ru

Kaneyasu, Hirono ; Hayashi, Nobuhiko ; Gut, Bruno ; Makoshi, Kenji ; Sigrist, Manfred

In: Journal of the Physical Society of Japan, 2010, vol. 79, p. 104705

The inhomogeneous 3-Kelvin (3K) phase of the eutectic Sr₂RuO₄ with Ru inclusions nucleates superconductivity at the interface between Ru and Sr₂RuO₄. The structure of the interface state and its physical properties are examined here. Two superconducting phases are identified between the transitions to the bulk phase at 1.5 K and to the 3K phase. The nucleation of the 3K phase results in a... Plus

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    Summary
    The inhomogeneous 3-Kelvin (3K) phase of the eutectic Sr₂RuO₄ with Ru inclusions nucleates superconductivity at the interface between Ru and Sr₂RuO₄. The structure of the interface state and its physical properties are examined here. Two superconducting phases are identified between the transitions to the bulk phase at 1.5 K and to the 3K phase. The nucleation of the 3K phase results in a state conserving time reversal symmetry, which generates an intrinsically frustrated superconducting network in samples with many Ru inclusions. At a lower temperature (>1.5 K), a discontinuous (first order) transition to an interface state breaking time reversal symmetry is found leading to an unfrustrated network phase. It is shown that this phase transition located at a temperature between 1.5 and 3 K would yield the anomalous property showing that the critical current in such a network depends on the sign of the current, reproducing recent experimental observations.