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

Mark E. Barber, Alexandra S. Gibbs, Yoshiteru Maeno, Andrew P. Mackenzie, Clifford 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 Sr2RuO4 under uniaxial pressure. There is strong
evidence that, as well as driving Tc through a maximum at ∼3.5 K, compressive strains ε of nearly 1% along the crystallographic [100] axis drive the γ 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.
Original languageEnglish
Article number076602
Number of pages6
JournalPhysical Review Letters
Volume120
Issue number7
Early online date14 Feb 2018
DOIs
Publication statusPublished - 16 Feb 2018

Keywords

  • cond-mat.str-el

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