Constraints on the superconducting order parameter in Sr2RuO4 from oxygen-17 nuclear magnetic resonance

Research output: Contribution to journalArticlepeer-review

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Constraints on the superconducting order parameter in Sr2RuO4 from oxygen-17 nuclear magnetic resonance. / Pustogow, A.; Luo, Yongkang; Chronister, A.; Su, Y.-S.; Sokolov, D. A.; Jerzembeck, F.; Mackenzie, A. P.; Hicks, C. W.; Kikugawa, N.; Raghu, S.; Bauer, E. D.; Brown, S. E.

In: Nature, Vol. 574, No. 7776, 03.10.2019, p. 72-75.

Research output: Contribution to journalArticlepeer-review

Harvard

Pustogow, A, Luo, Y, Chronister, A, Su, Y-S, Sokolov, DA, Jerzembeck, F, Mackenzie, AP, Hicks, CW, Kikugawa, N, Raghu, S, Bauer, ED & Brown, SE 2019, 'Constraints on the superconducting order parameter in Sr2RuO4 from oxygen-17 nuclear magnetic resonance', Nature, vol. 574, no. 7776, pp. 72-75. https://doi.org/10.1038/s41586-019-1596-2

APA

Pustogow, A., Luo, Y., Chronister, A., Su, Y-S., Sokolov, D. A., Jerzembeck, F., Mackenzie, A. P., Hicks, C. W., Kikugawa, N., Raghu, S., Bauer, E. D., & Brown, S. E. (2019). Constraints on the superconducting order parameter in Sr2RuO4 from oxygen-17 nuclear magnetic resonance. Nature, 574(7776), 72-75. https://doi.org/10.1038/s41586-019-1596-2

Vancouver

Pustogow A, Luo Y, Chronister A, Su Y-S, Sokolov DA, Jerzembeck F et al. Constraints on the superconducting order parameter in Sr2RuO4 from oxygen-17 nuclear magnetic resonance. Nature. 2019 Oct 3;574(7776):72-75. https://doi.org/10.1038/s41586-019-1596-2

Author

Pustogow, A. ; Luo, Yongkang ; Chronister, A. ; Su, Y.-S. ; Sokolov, D. A. ; Jerzembeck, F. ; Mackenzie, A. P. ; Hicks, C. W. ; Kikugawa, N. ; Raghu, S. ; Bauer, E. D. ; Brown, S. E. / Constraints on the superconducting order parameter in Sr2RuO4 from oxygen-17 nuclear magnetic resonance. In: Nature. 2019 ; Vol. 574, No. 7776. pp. 72-75.

Bibtex

@article{f3b47238f9b544cfac5327e2674ff166,
title = "Constraints on the superconducting order parameter in Sr2RuO4 from oxygen-17 nuclear magnetic resonance",
abstract = "Phases of matter are usually identified through spontaneous symmetry breaking, especially regarding unconventional superconductivity and the interactions from which it originates. In that context, the superconducting state of the quasi-two-dimensional and strongly correlated perovskite Sr2RuO4 is considered to be the only solid-state analogue to the superfluid 3He-A phase1,2, with an odd-parity order parameter that is unidirectional in spin space for all electron momenta and breaks time-reversal symmetry. This characterization was recently called into question by a search for an expected {\textquoteleft}split{\textquoteright} transition in a Sr2RuO4 crystal under in-plane uniaxial pressure, which failed to find any such evidence; instead, a dramatic rise and a peak in a single-transition temperature were observed3,4. Here we use nuclear magnetic resonance (NMR) spectroscopy of oxygen-17, which is directly sensitive to the order parameter via hyperfine coupling to the electronic spin degrees of freedom, to probe the nature of superconductivity in Sr2RuO4 and its evolution under strain. A reduction of the Knight shift is observed for all strain values and at temperatures below the critical temperature, consistent with a drop in spin polarization in the superconducting state. In unstrained samples, our results contradict a body of previous NMR work reporting no change in the Knight shift5 and the most prevalent theoretical interpretation of the order parameter as a chiral p-wave state. Sr2RuO4 is an extremely clean layered perovskite and its superconductivity emerges from a strongly correlated Fermi liquid, and our work imposes tight constraints on the order parameter symmetry of this archetypal system.",
author = "A. Pustogow and Yongkang Luo and A. Chronister and Y.-S. Su and Sokolov, {D. A.} and F. Jerzembeck and Mackenzie, {A. P.} and Hicks, {C. W.} and N. Kikugawa and S. Raghu and Bauer, {E. D.} and Brown, {S. E.}",
year = "2019",
month = oct,
day = "3",
doi = "10.1038/s41586-019-1596-2",
language = "English",
volume = "574",
pages = "72--75",
journal = "Nature",
issn = "0028-0836",
publisher = "Nature Publishing Group",
number = "7776",

}

RIS

TY - JOUR

T1 - Constraints on the superconducting order parameter in Sr2RuO4 from oxygen-17 nuclear magnetic resonance

AU - Pustogow, A.

AU - Luo, Yongkang

AU - Chronister, A.

AU - Su, Y.-S.

AU - Sokolov, D. A.

AU - Jerzembeck, F.

AU - Mackenzie, A. P.

AU - Hicks, C. W.

AU - Kikugawa, N.

AU - Raghu, S.

AU - Bauer, E. D.

AU - Brown, S. E.

PY - 2019/10/3

Y1 - 2019/10/3

N2 - Phases of matter are usually identified through spontaneous symmetry breaking, especially regarding unconventional superconductivity and the interactions from which it originates. In that context, the superconducting state of the quasi-two-dimensional and strongly correlated perovskite Sr2RuO4 is considered to be the only solid-state analogue to the superfluid 3He-A phase1,2, with an odd-parity order parameter that is unidirectional in spin space for all electron momenta and breaks time-reversal symmetry. This characterization was recently called into question by a search for an expected ‘split’ transition in a Sr2RuO4 crystal under in-plane uniaxial pressure, which failed to find any such evidence; instead, a dramatic rise and a peak in a single-transition temperature were observed3,4. Here we use nuclear magnetic resonance (NMR) spectroscopy of oxygen-17, which is directly sensitive to the order parameter via hyperfine coupling to the electronic spin degrees of freedom, to probe the nature of superconductivity in Sr2RuO4 and its evolution under strain. A reduction of the Knight shift is observed for all strain values and at temperatures below the critical temperature, consistent with a drop in spin polarization in the superconducting state. In unstrained samples, our results contradict a body of previous NMR work reporting no change in the Knight shift5 and the most prevalent theoretical interpretation of the order parameter as a chiral p-wave state. Sr2RuO4 is an extremely clean layered perovskite and its superconductivity emerges from a strongly correlated Fermi liquid, and our work imposes tight constraints on the order parameter symmetry of this archetypal system.

AB - Phases of matter are usually identified through spontaneous symmetry breaking, especially regarding unconventional superconductivity and the interactions from which it originates. In that context, the superconducting state of the quasi-two-dimensional and strongly correlated perovskite Sr2RuO4 is considered to be the only solid-state analogue to the superfluid 3He-A phase1,2, with an odd-parity order parameter that is unidirectional in spin space for all electron momenta and breaks time-reversal symmetry. This characterization was recently called into question by a search for an expected ‘split’ transition in a Sr2RuO4 crystal under in-plane uniaxial pressure, which failed to find any such evidence; instead, a dramatic rise and a peak in a single-transition temperature were observed3,4. Here we use nuclear magnetic resonance (NMR) spectroscopy of oxygen-17, which is directly sensitive to the order parameter via hyperfine coupling to the electronic spin degrees of freedom, to probe the nature of superconductivity in Sr2RuO4 and its evolution under strain. A reduction of the Knight shift is observed for all strain values and at temperatures below the critical temperature, consistent with a drop in spin polarization in the superconducting state. In unstrained samples, our results contradict a body of previous NMR work reporting no change in the Knight shift5 and the most prevalent theoretical interpretation of the order parameter as a chiral p-wave state. Sr2RuO4 is an extremely clean layered perovskite and its superconductivity emerges from a strongly correlated Fermi liquid, and our work imposes tight constraints on the order parameter symmetry of this archetypal system.

U2 - 10.1038/s41586-019-1596-2

DO - 10.1038/s41586-019-1596-2

M3 - Article

VL - 574

SP - 72

EP - 75

JO - Nature

JF - Nature

SN - 0028-0836

IS - 7776

ER -