mu SR studies of superconductivity in eutectically grown mixed ruthenates

T. Shiroka*, R. Fittipaldi, M. Cuoco, R. De Renzi, Y. Maeno, R. J. Lycett, S. Ramos, E. M. Forgan, C. Baines, A. Rost, V. Granata, A. Vecchione

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

The low-temperature magnetic behavior of the double-layered ruthenate Sr3Ru2O7, as grown from a eutectic Sr2RuO4-Sr3Ru2O7 system, was investigated via zero-and transverse-field muon-spin rotation. The gradual increase of the muon relaxation rate observed below 2.5 K, even in the absence of applied magnetic fields, indicates the occurrence of a spontaneous breaking of time-reversal symmetry. The onset of the latter at a temperature above 1.5 K, the T-c of the single phase Sr2RuO4, provides evidence about an unconventional superconducting state in the eutectic phase, which most likely takes place at the interface between the Sr2RuO4 and Sr3Ru2O7 domains, or even inside the Sr3Ru2O7 phase. We show that the superconducting state manifests a two-component behavior in the transverse-field response with change-over at about T = 2.5 K and T = 1.5 K. The comparison with zero-field mu SR data in the Ru-Sr2RuO4 eutectic system rules out the possibility of spurious effects due to embedded Ru islands.

Original languageEnglish
Article number134527
Number of pages7
JournalPhysical Review. B, Condensed matter and materials physics
Volume85
Issue number13
DOIs
Publication statusPublished - 26 Apr 2012

Keywords

  • QUALITY SINGLE-CRYSTALS
  • SR2RUO4
  • SR3RU2O7
  • STATE
  • ENHANCEMENT
  • DEPENDENCE
  • LATTICE

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