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Resistivity in the Vicinity of a van Hove Singularity: Sr2RuO4 under Uniaxial Pressure

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Barber,  M. E.
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Mackenzie,  A. P.
Andrew Mackenzie, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Hicks,  C. W.
Clifford Hicks, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Barber, M. E., Gibbs, A. S., Maeno, Y., Mackenzie, A. P., & Hicks, C. W. (2018). Resistivity in the Vicinity of a van Hove Singularity: Sr2RuO4 under Uniaxial Pressure. Physical Review Letters, 120(7): 076602, pp. 1-6. doi:10.1103/PhysRevLett.120.076602.


Cite as: https://hdl.handle.net/21.11116/0000-0000-B879-9
Abstract
We report the results of a combined study of the normal-state resistivity and superconducting transition temperature T-c of the unconventional superconductor Sr2RuO4 under uniaxial pressure. There is strong evidence that, as well as driving T-c through a maximum at similar to 3.5 K, compressive strains epsilon of nearly 1% along the crystallographic [100] axis drive the gamma Fermi surface sheet through a van Hove singularity, changing the temperature dependence of the resistivity from T-2 above, and below the transition region to T-1.5 within it. This occurs in extremely pure single-crystals in which the impurity contribution to the resistivity is < 100 n Omega cm, so our study also highlights the potential of uniaxial pressure as a more general probe of this class of physics in clean systems.