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

Nature Materials
J P CarloY J Uemura

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(2)RuO(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(2)RuO(4) emerges from a surrounding Fermi-liquid metallic state. Using muon spin relaxation and magnetic susceptibility measurements, we demonstrate here that (Sr,Ca)(2)RuO(4) has a ground state with static magnetic order over nearly the entire range of (Ca, Sr) substitution, with spin-glass behaviour in Sr(1.5)Ca(0.5)RuO(4) and Ca(1.5)Sr(0.5)RuO(4). The resulting new magnetic phase diagram establishes the proximity of superconductivity in Sr(2)RuO(4) to competing static magnetic order.

References

Jan 1, 1985·Physical Review. B, Condensed Matter·Y J UemuraE J Ansaldo
Sep 1, 1993·Physical Review. B, Condensed Matter·L P LeG Grüner
Oct 4, 2000·Physical Review Letters·S Nakatsuji, Y Maeno
May 15, 2002·Physical Review Letters·M BradenY Maeno
Sep 13, 2002·Physical Review Letters·Naoki Kikugawa, Yoshiteru Maeno
Apr 12, 2003·Physical Review Letters·S NakatsujiY Maeno
Nov 5, 2004·Physical Review Letters·O FriedtY Maeno
Mar 25, 2009·Nature Materials·Yasutomo J Uemura

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Citations

Sep 5, 2015·Scientific Reports·Ehsan Bolhasani, Alireza Valizadeh
Jul 15, 2015·Nature Communications·E SvanidzeE Morosan
Jun 22, 2019·Nature Communications·Xiaoyu DengGabriel Kotliar
May 28, 2016·Physical Review Letters·B BurganovK M Shen
Apr 22, 2017·Physical Review Letters·S KunkemöllerM Braden
Oct 6, 2021·Nature Communications·R FittipaldiA Di Bernardo

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