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Resistivity in the vicinity of a van Hove singularity: Sr2RuO4 under uniaxial pressure

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Author(s)

M. E. Barber, A. S. Gibbs, Y. Maeno, A. P. Mackenzie, C. W. Hicks

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Abstract

We report the results of a combined study of the normal-state resistivity and superconducting transition temperature Tc of the unconventional superconductor Sr2RuOunder uniaxial pressure. There is strong evidence that, as well as driving Tc 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 T2 above, and below the transition region to T1.5 within it. This occurs in extremely pure single-crystals in which the impurity contribution to the resistivity is <100 nΩ cm, so our study also highlights the potential of uniaxial pressure as a more general probe of this class of physics in clean systems.

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Original languageEnglish
Article number076602
Number of pages6
JournalPhysical Review Letters
Volume120
Issue number7
DOIs
Publication statusPublished - 14 Feb 2018

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