Anomalous Josephson network in the Ru-Sr 2 RuO 4 eutectic system

J. Hooper, Zhiqiang Mao, K. D. Nelson, Ying Liu, M. Wada, Y. Maeno

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

We measured the c-axis current-voltage (I-V) characteristics of Sr 2 RuO 4 and Ru-enriched Sr 2 RuO 4 eutectic systems. Our results revealed that the 3-K phase in the Ru-Sr 2 RuO 4 eutectic system forms a complex Josephson network, which dominates the critical current of the system even at temperatures below bulk T c . We also found that this Josephson network exhibits anomalous asymmetric features in I-V characteristics, such that the critical current density at positive current J c + differs from that at negative current J c - 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
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume70
Issue number1
DOIs
StatePublished - Jul 1 2004

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eutectics
Eutectics
Critical currents
critical current
Temperature distribution
Magnetic fields
Temperature
broken symmetry
Electric potential
temperature distribution
current density
temperature
electric potential
magnetic fields

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

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title = "Anomalous Josephson network in the Ru-Sr 2 RuO 4 eutectic system",
abstract = "We measured the c-axis current-voltage (I-V) characteristics of Sr 2 RuO 4 and Ru-enriched Sr 2 RuO 4 eutectic systems. Our results revealed that the 3-K phase in the Ru-Sr 2 RuO 4 eutectic system forms a complex Josephson network, which dominates the critical current of the system even at temperatures below bulk T c . We also found that this Josephson network exhibits anomalous asymmetric features in I-V characteristics, such that the critical current density at positive current J c + differs from that at negative current J c - 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.",
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Anomalous Josephson network in the Ru-Sr 2 RuO 4 eutectic system . / Hooper, J.; Mao, Zhiqiang; Nelson, K. D.; Liu, Ying; Wada, M.; Maeno, Y.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 70, No. 1, 014510, 01.07.2004.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Anomalous Josephson network in the Ru-Sr 2 RuO 4 eutectic system

AU - Hooper, J.

AU - Mao, Zhiqiang

AU - Nelson, K. D.

AU - Liu, Ying

AU - Wada, M.

AU - Maeno, Y.

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N2 - We measured the c-axis current-voltage (I-V) characteristics of Sr 2 RuO 4 and Ru-enriched Sr 2 RuO 4 eutectic systems. Our results revealed that the 3-K phase in the Ru-Sr 2 RuO 4 eutectic system forms a complex Josephson network, which dominates the critical current of the system even at temperatures below bulk T c . We also found that this Josephson network exhibits anomalous asymmetric features in I-V characteristics, such that the critical current density at positive current J c + differs from that at negative current J c - 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.

AB - We measured the c-axis current-voltage (I-V) characteristics of Sr 2 RuO 4 and Ru-enriched Sr 2 RuO 4 eutectic systems. Our results revealed that the 3-K phase in the Ru-Sr 2 RuO 4 eutectic system forms a complex Josephson network, which dominates the critical current of the system even at temperatures below bulk T c . We also found that this Josephson network exhibits anomalous asymmetric features in I-V characteristics, such that the critical current density at positive current J c + differs from that at negative current J c - 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.

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