Anomalous Josephson network in the Ru-Sr2RuO4 eutectic system

J. Hooper, Z. Q. Mao, K. D. Nelson, Y. Liu, M. Wada, Y. Maeno

Research output: Contribution to journalArticle

17 Scopus citations

Abstract

We measured the c-axis current-voltage (I-V) characteristics of Sr 2RuO4 and Ru-enriched Sr2RuO4 eutectic systems. Our results revealed that the 3-K phase in the Ru-Sr 2RuO4 eutectic system forms a complex Josephson network, which dominates the critical current of the system even at temperatures below bulk Tc. We also found that this Josephson network exhibits anomalous asymmetric features in I-V characteristics, such that the critical current density at positive current Jc+ differs from that at negative current Jc- by 5% at 0.3 K. This unusual behavior diminishes with increasing temperature or magnetic field. It disappears at temperatures above 2.3 K at zero field, or above 0.2 T at 0.3 K. We discuss these unusual behaviors in terms of a recent theory that argues a time reversal symmetry breaking transition in the 3-K phase.

Original languageEnglish (US)
Article number014510
Pages (from-to)014510-1-014510-4
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume70
Issue number1
DOIs
StatePublished - Jul 1 2004

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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