Strong peak in Tc of Sr2RuO4 under uniaxial pressure

Alexander Steppke; Lishan Zhao; Mark Barber; Thomas Scaffidi; Fabian Jerzembeck; Helge Rosner; Alexandra Sarah Gibbs; Yoshiteru Maeno; Steven H Simon; Andrew Peter Mackenzie; Clifford Hicks

doi:10.1126/science.aaf9398

Strong peak in T_c of Sr₂RuO₄ under uniaxial pressure

Alexander Steppke, Lishan Zhao, Mark Barber, Thomas Scaffidi, Fabian Jerzembeck, Helge Rosner, Alexandra Sarah Gibbs, Yoshiteru Maeno, Steven H Simon, Andrew Peter Mackenzie, Clifford Hicks

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Abstract

Sr₂RuO₄ is an unconventional superconductor that has attracted widespread study because of its high purity and the possibility that its superconducting order parameter has odd parity. We study the dependence of its superconductivity on anisotropic strain. Applying uniaxial pressures of up to ~1 gigapascals along a 〈100〉 direction (a axis) of the crystal lattice results in the transition temperature (T_c) increasing from 1.5 kelvin in the unstrained material to 3.4 kelvin at compression by ≈0.6%, and then falling steeply. Calculations give evidence that the observed maximum T_c occurs at or near a Lifshitz transition when the Fermi level passes through a Van Hove singularity, and open the possibility that the highly strained, T_c = 3.4 K Sr₂RuO₄ has an even-parity, rather than an odd-parity, order parameter.

Original language	English
Article number	eaaf9398
Pages (from-to)	1-9
Number of pages	9
Journal	Science
Volume	355
Issue number	6321
DOIs	https://doi.org/10.1126/science.aaf9398
Publication status	Published - 13 Jan 2017

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Steppke_2016_Strong_Science_AAM
© 2017, the Author(s). This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at www.sciencemag.org / https://doi.org/10.1126/science.aaf9398
Accepted author manuscript, 742 KB

Topological Protection and NonEquilibriu: Topological Protection and NonEquilibrium States in Strongly Correlated Electron Systems
Wahl, P. (PI), Baumberger, F. (CoI), Davis, J. C. (CoI), Green, A. (CoI), Hooley, C. (CoI), Keeling, J. M. J. (CoI) & Mackenzie, A. (CoI)
EPSRC
1/09/11 → 31/08/17
Project: Standard

Alexandra Gibbs
- a.gibbsst-andrews.acuk
- School of Chemistry - EPSRC Early Career Fellow
- Centre for Designer Quantum Materials
Person: Academic - Research
Andrew Mackenzie
- apm9st-andrews.acuk
- School of Physics and Astronomy - Professor
- Condensed Matter Physics
Person: Academic

Underpinning Data - Strong Peak in T_c of Sr _2RuO _4 Under Uniaxial Pressure
Steppke, A. (Creator), Zhao, L. (Creator), Barber, M. (Creator), Scaffidi, T. (Creator), Jerzembeck, F. (Creator), Rosner, H. (Creator), Gibbs, A. S. (Creator), Maeno, Y. (Creator), Simon, S. (Creator), Mackenzie, A. (Creator) & Hicks, C. W. (Creator), University of St Andrews, 2016
DOI: 10.17630/d2b438fc-2f65-4575-89a3-3296ce5c3a17
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Cite this

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abstract = "Sr2RuO4 is an unconventional superconductor that has attracted widespread study because of its high purity and the possibility that its superconducting order parameter has odd parity. We study the dependence of its superconductivity on anisotropic strain. Applying uniaxial pressures of up to ~1 gigapascals along a 〈100〉 direction (a axis) of the crystal lattice results in the transition temperature (Tc) increasing from 1.5 kelvin in the unstrained material to 3.4 kelvin at compression by ≈0.6%, and then falling steeply. Calculations give evidence that the observed maximum Tc occurs at or near a Lifshitz transition when the Fermi level passes through a Van Hove singularity, and open the possibility that the highly strained, Tc = 3.4 K Sr2RuO4 has an even-parity, rather than an odd-parity, order parameter.",

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T1 - Strong peak in Tc of Sr2RuO4 under uniaxial pressure

AU - Steppke, Alexander

AU - Zhao, Lishan

AU - Barber, Mark

AU - Scaffidi, Thomas

AU - Jerzembeck, Fabian

AU - Rosner, Helge

AU - Gibbs, Alexandra Sarah

AU - Maeno, Yoshiteru

AU - Simon, Steven H

AU - Mackenzie, Andrew Peter

AU - Hicks, Clifford

PY - 2017/1/13

Y1 - 2017/1/13

N2 - Sr2RuO4 is an unconventional superconductor that has attracted widespread study because of its high purity and the possibility that its superconducting order parameter has odd parity. We study the dependence of its superconductivity on anisotropic strain. Applying uniaxial pressures of up to ~1 gigapascals along a 〈100〉 direction (a axis) of the crystal lattice results in the transition temperature (Tc) increasing from 1.5 kelvin in the unstrained material to 3.4 kelvin at compression by ≈0.6%, and then falling steeply. Calculations give evidence that the observed maximum Tc occurs at or near a Lifshitz transition when the Fermi level passes through a Van Hove singularity, and open the possibility that the highly strained, Tc = 3.4 K Sr2RuO4 has an even-parity, rather than an odd-parity, order parameter.

AB - Sr2RuO4 is an unconventional superconductor that has attracted widespread study because of its high purity and the possibility that its superconducting order parameter has odd parity. We study the dependence of its superconductivity on anisotropic strain. Applying uniaxial pressures of up to ~1 gigapascals along a 〈100〉 direction (a axis) of the crystal lattice results in the transition temperature (Tc) increasing from 1.5 kelvin in the unstrained material to 3.4 kelvin at compression by ≈0.6%, and then falling steeply. Calculations give evidence that the observed maximum Tc occurs at or near a Lifshitz transition when the Fermi level passes through a Van Hove singularity, and open the possibility that the highly strained, Tc = 3.4 K Sr2RuO4 has an even-parity, rather than an odd-parity, order parameter.

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DO - 10.1126/science.aaf9398

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M1 - eaaf9398

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Strong peak in Tc of Sr2RuO4 under uniaxial pressure

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Topological Protection and NonEquilibriu: Topological Protection and NonEquilibrium States in Strongly Correlated Electron Systems

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Andrew Mackenzie

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Underpinning Data - Strong Peak in T_c of Sr _2RuO _4 Under Uniaxial Pressure

Cite this

Strong peak in T_c of Sr₂RuO₄ under uniaxial pressure