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

doi:10.1038/nmat3236

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

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59 Scopus citations

Abstract

High-T_c cuprates, iron pnictides, organic BEDT and TMTSF, alkali-doped C₆₀, 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. Sr₂RuO₄ 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 Sr₂RuO₄ emerges from a surrounding Fermi-liquid metallic state. Using muon spin relaxation and magnetic susceptibility measurements, we demonstrate here that (Sr,Ca) ₂RuO₄ 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_0.5RuO₄ and Ca_1.5Sr _0.5RuO₄. The resulting new magnetic phase diagram establishes the proximity of superconductivity in Sr₂RuO₄ to competing static magnetic order.

Original language	English
Pages (from-to)	323-328
Number of pages	6
Journal	Nature Materials
Volume	11
Issue number	4
DOIs	https://doi.org/10.1038/nmat3236
State	Published - Apr 2012
Externally published	Yes

Funding

This work has been supported by the US National Science Foundation (NSF) under the Materials World Network (MWN: DMR-0502706 and 0806846), the Partnership for International Research and Education (PIRE: OISE-0968226) and DMR-1105961 programs at Columbia, by the Canadian Natural Sciences and Engineering Research Council (NSERC) and the Canadian Institute for Advanced Research (CIFAR) at McMaster, and by Grants-in-Aid (No. 21684019) from the Japan Society for the Promotion of Science (JSPS) and (No. 19052003) for Scientific Research on Priority Areas (SRPA) from the Ministry of Education, Culture, Sports, Science and Technology (MEXT) at Kyoto and Tokyo Universities, and by MEXT-SRPA (No. 19052006) at Osaka University.

Funders	Funder number
MEXT-SRPA	19052006
Materials World Network	0806846, DMR-1105961, OISE-0968226, DMR-0502706
National Science Foundation	1105961
Canadian Institute for Advanced Research	21684019
Natural Sciences and Engineering Research Council of Canada
Japan Society for the Promotion of Science	19052003
Ministry of Education, Culture, Sports, Science and Technology
Osaka University

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

abstract = "High-Tc cuprates, iron pnictides, organic BEDT and TMTSF, alkali-doped C60, 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. Sr2RuO4 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 Sr2RuO4 emerges from a surrounding Fermi-liquid metallic state. Using muon spin relaxation and magnetic susceptibility measurements, we demonstrate here that (Sr,Ca) 2RuO4 has a ground state with static magnetic order over nearly the entire range of (Ca, Sr) substitution, with spin-glass behaviour in Sr1.5Ca0.5RuO4 and Ca1.5Sr 0.5RuO4. The resulting new magnetic phase diagram establishes the proximity of superconductivity in Sr2RuO4 to competing static magnetic order.",

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

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AU - Carlo, J. P.

AU - Goko, T.

AU - Gat-Malureanu, I. M.

AU - Russo, P. L.

AU - Savici, A. T.

AU - Aczel, A. A.

AU - MacDougall, G. J.

AU - Rodriguez, J. A.

AU - Williams, T. J.

AU - Luke, G. M.

AU - Wiebe, C. R.

AU - Yoshida, Y.

AU - Nakatsuji, S.

AU - Maeno, Y.

AU - Taniguchi, T.

AU - Uemura, Y. J.

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N2 - High-Tc cuprates, iron pnictides, organic BEDT and TMTSF, alkali-doped C60, 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. Sr2RuO4 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 Sr2RuO4 emerges from a surrounding Fermi-liquid metallic state. Using muon spin relaxation and magnetic susceptibility measurements, we demonstrate here that (Sr,Ca) 2RuO4 has a ground state with static magnetic order over nearly the entire range of (Ca, Sr) substitution, with spin-glass behaviour in Sr1.5Ca0.5RuO4 and Ca1.5Sr 0.5RuO4. The resulting new magnetic phase diagram establishes the proximity of superconductivity in Sr2RuO4 to competing static magnetic order.

AB - High-Tc cuprates, iron pnictides, organic BEDT and TMTSF, alkali-doped C60, 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. Sr2RuO4 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 Sr2RuO4 emerges from a surrounding Fermi-liquid metallic state. Using muon spin relaxation and magnetic susceptibility measurements, we demonstrate here that (Sr,Ca) 2RuO4 has a ground state with static magnetic order over nearly the entire range of (Ca, Sr) substitution, with spin-glass behaviour in Sr1.5Ca0.5RuO4 and Ca1.5Sr 0.5RuO4. The resulting new magnetic phase diagram establishes the proximity of superconductivity in Sr2RuO4 to competing static magnetic order.

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

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