Competition between antiferromagnetism and ferromagnetism in Sr 2RuO4 probed by Mn and Co doping

J. E. Ortmann; J. Y. Liu; J. Hu; M. Zhu; J. Peng; M. Matsuda; X. Ke; Z. Q. Mao

doi:10.1038/srep02950

Competition between antiferromagnetism and ferromagnetism in Sr ₂RuO₄ probed by Mn and Co doping

J. E. Ortmann, J. Y. Liu, J. Hu, M. Zhu, J. Peng, M. Matsuda, X. Ke, Z. Q. Mao

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Abstract

Spin-triplet superconductivity in Sr₂RuO₄ has attracted enormous interest. Like other unconventional superconductors, superconductivity in Sr₂RuO₄ is in close proximity to magnetic instability. Undoped Sr₂RuO₄ exhibits incommensurate antiferromagnetic (AFM) fluctuations, which can evolve into static, short-range AFM order via Ti doping. Moreover, weak ferromagnetic (FM) coupling in Sr₂RuO₄ has also been suggested by NMR/neutron scattering experiments and studies on Ca_2-xSr_xRuO ₄ and Sr_2-yLa_yRuO₄, implying orbital dependent magnetism. We report bulk static, short-range FM order in Sr ₂RuO₄ triggered by <2% Co doping, showing superconductivity in Sr₂RuO₄ is much closer to FM instability than previously reported in Ca_2-xSr_xRuO ₄. We also find Mn doping can effectively establish incommensurate AFM order, with T_N ∼ 50 K for 3% Mn doping. These new results place Sr₂RuO₄ in a unique situation where superconductivity lies directly on the borderline of two distinct magnetic states, highlighting the important role of competing magnetic fluctuations in determining superconducting properties of Sr₂RuO₄.

Original language	English
Article number	2950
Journal	Scientific Reports
Volume	3
DOIs	https://doi.org/10.1038/srep02950
State	Published - Oct 15 2013

Funding

The work is supported by the NSF under grant DMR-1205469 and the LA-SiGMA program under award #EPS-1003897. X. K. acknowledges the financial support from the start-up funds at Michigan State University. Research at ORNL’s High Flux Isotope Reactor was sponsored by DOE basic Energy Sciences, Scientific User Facilities Division. The authors are grateful to L. Zheng and X.S. Wu for informative discussions.

Funders	Funder number
DOE Basic Energy Sciences
National Science Foundation	1205469, 1003897, DMR-1205469
Michigan State University

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title = "Competition between antiferromagnetism and ferromagnetism in Sr 2RuO4 probed by Mn and Co doping",

abstract = "Spin-triplet superconductivity in Sr2RuO4 has attracted enormous interest. Like other unconventional superconductors, superconductivity in Sr2RuO4 is in close proximity to magnetic instability. Undoped Sr2RuO4 exhibits incommensurate antiferromagnetic (AFM) fluctuations, which can evolve into static, short-range AFM order via Ti doping. Moreover, weak ferromagnetic (FM) coupling in Sr2RuO4 has also been suggested by NMR/neutron scattering experiments and studies on Ca2-xSrxRuO 4 and Sr2-yLayRuO4, implying orbital dependent magnetism. We report bulk static, short-range FM order in Sr 2RuO4 triggered by <2% Co doping, showing superconductivity in Sr2RuO4 is much closer to FM instability than previously reported in Ca2-xSrxRuO 4. We also find Mn doping can effectively establish incommensurate AFM order, with TN ∼ 50 K for 3% Mn doping. These new results place Sr2RuO4 in a unique situation where superconductivity lies directly on the borderline of two distinct magnetic states, highlighting the important role of competing magnetic fluctuations in determining superconducting properties of Sr2RuO4.",

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AU - Ortmann, J. E.

AU - Liu, J. Y.

AU - Hu, J.

AU - Zhu, M.

AU - Peng, J.

AU - Matsuda, M.

AU - Ke, X.

AU - Mao, Z. Q.

PY - 2013/10/15

Y1 - 2013/10/15

N2 - Spin-triplet superconductivity in Sr2RuO4 has attracted enormous interest. Like other unconventional superconductors, superconductivity in Sr2RuO4 is in close proximity to magnetic instability. Undoped Sr2RuO4 exhibits incommensurate antiferromagnetic (AFM) fluctuations, which can evolve into static, short-range AFM order via Ti doping. Moreover, weak ferromagnetic (FM) coupling in Sr2RuO4 has also been suggested by NMR/neutron scattering experiments and studies on Ca2-xSrxRuO 4 and Sr2-yLayRuO4, implying orbital dependent magnetism. We report bulk static, short-range FM order in Sr 2RuO4 triggered by <2% Co doping, showing superconductivity in Sr2RuO4 is much closer to FM instability than previously reported in Ca2-xSrxRuO 4. We also find Mn doping can effectively establish incommensurate AFM order, with TN ∼ 50 K for 3% Mn doping. These new results place Sr2RuO4 in a unique situation where superconductivity lies directly on the borderline of two distinct magnetic states, highlighting the important role of competing magnetic fluctuations in determining superconducting properties of Sr2RuO4.

AB - Spin-triplet superconductivity in Sr2RuO4 has attracted enormous interest. Like other unconventional superconductors, superconductivity in Sr2RuO4 is in close proximity to magnetic instability. Undoped Sr2RuO4 exhibits incommensurate antiferromagnetic (AFM) fluctuations, which can evolve into static, short-range AFM order via Ti doping. Moreover, weak ferromagnetic (FM) coupling in Sr2RuO4 has also been suggested by NMR/neutron scattering experiments and studies on Ca2-xSrxRuO 4 and Sr2-yLayRuO4, implying orbital dependent magnetism. We report bulk static, short-range FM order in Sr 2RuO4 triggered by <2% Co doping, showing superconductivity in Sr2RuO4 is much closer to FM instability than previously reported in Ca2-xSrxRuO 4. We also find Mn doping can effectively establish incommensurate AFM order, with TN ∼ 50 K for 3% Mn doping. These new results place Sr2RuO4 in a unique situation where superconductivity lies directly on the borderline of two distinct magnetic states, highlighting the important role of competing magnetic fluctuations in determining superconducting properties of Sr2RuO4.

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Competition between antiferromagnetism and ferromagnetism in Sr ₂RuO₄ probed by Mn and Co doping

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