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μSR 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, and A. Vecchione
Phys. Rev. B 85, 134527 – Published 26 April 2012

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 Tc 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 μSR data in the Ru-Sr2RuO4 eutectic system rules out the possibility of spurious effects due to embedded Ru islands.

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  • Received 9 August 2011

DOI:https://doi.org/10.1103/PhysRevB.85.134527

©2012 American Physical Society

Authors & Affiliations

T. Shiroka1,2,*, R. Fittipaldi3,4, M. Cuoco3,4, R. De Renzi5, Y. Maeno6, R. J. Lycett7, S. Ramos7,8, E. M. Forgan7, C. Baines2, A. Rost9, V. Granata3,4,9, and A. Vecchione3,4

  • 1Laboratorium für Festkörperphysik, ETH Hönggerberg, CH-8093 Zürich, Switzerland
  • 2Laboratory for Muon-Spin Spectroscopy, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
  • 3CNR-SPIN UOS Salerno, I-84084 Fisciano (SA), Italy
  • 4Dipartimento di Fisica “E. R. Caianiello”, Università di Salerno, I-84084 Fisciano (SA), Italy
  • 5Dipartimento di Fisica and Unità CNISM, Università di Parma, I-43124 Parma, Italy
  • 6Department of Physics, Kyoto University, Kyoto 606-8502, Japan
  • 7School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham B15 2TT, United Kingdom
  • 8Diamond Light Source Ltd., Harwell Science and Innovation Campus, Didcot OX11 0DE, United Kingdom
  • 9Scottish Universities Physics Alliance, School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews KY16 9SS, Scotland

  • *tshiroka@phys.ethz.ch

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Issue

Vol. 85, Iss. 13 — 1 April 2012

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