New magnetic phase diagram of (Sr,Ca)2 RuO4

J. P. Carlo, T. Goko, I. M. Gat-Malureanu, P. L. Russo, A. T. Savici, A. A. Aczel, G. J. MacDougall, J. A. Rodriguez, T. J. Williams, G. M. Luke, C. R. Wiebe, Y. Yoshida, S. Nakatsuji, Y. Maeno, T. Taniguchi, Y. J. Uemura

Research output: Contribution to journalArticlepeer-review

Abstract

High-T c cuprates, iron pnictides, organic BEDT and TMTSF, alkali-doped C 60, and heavy-fermion systems have superconducting states adjacent to competing states exhibiting static antiferromagnetic or spin density wave order. This feature has promoted pictures for their superconducting pairing mediated by spin fluctuations. Sr 2RuO 4 is another unconventional superconductor which almost certainly has a p-wave pairing. The absence of known signatures of static magnetism in the Sr-rich side of the (Ca, Sr) substitution space, however, has led to a prevailing view that the superconducting state in Sr 2RuO 4 emerges from a surrounding Fermi-liquid metallic state. Using muon spin relaxation and magnetic susceptibility measurements, we demonstrate here that (Sr,Ca) 2RuO 4 has a ground state with static magnetic order over nearly the entire range of (Ca, Sr) substitution, with spin-glass behaviour in Sr 1.5Ca 0.5RuO 4 and Ca 1.5Sr 0.5RuO 4. The resulting new magnetic phase diagram establishes the proximity of superconductivity in Sr 2RuO 4 to competing static magnetic order.

Original languageEnglish (US)
Pages (from-to)323-328
Number of pages6
JournalNature Materials
Volume11
Issue number4
DOIs
StatePublished - Apr 2012
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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