Universal superconducting precursor in three classes of unconventional superconductors

D. Pelc (), Z. Anderson, B. Yu, C. Leighton and M. Greven ()
Additional contact information
D. Pelc: University of Minnesota
Z. Anderson: University of Minnesota
B. Yu: University of Minnesota
C. Leighton: University of Minnesota
M. Greven: University of Minnesota

Nature Communications, 2019, vol. 10, issue 1, 1-6

Abstract: Abstract A pivotal challenge posed by unconventional superconductors is to unravel how superconductivity emerges upon cooling from the generally complex normal state. Here, we use nonlinear magnetic response, a probe that is uniquely sensitive to the superconducting precursor, to uncover remarkable universal behaviour in three distinct classes of oxide superconductors: strontium titanate, strontium ruthenate, and the cuprate high-Tc materials. We find unusual exponential temperature dependence of the diamagnetic response above the transition temperature Tc, with a characteristic temperature scale that strongly varies with Tc. We correlate this scale with the sensitivity of Tc to local stress and show that it is influenced by intentionally-induced structural disorder. The universal behaviour is therefore caused by intrinsic, self-organized structural inhomogeneity, inherent to the oxides’ perovskite-based structure. The prevalence of such inhomogeneity has far-reaching implications for the interpretation of electronic properties of perovskite-related oxides in general.

Date: 2019
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DOI: 10.1038/s41467-019-10635-w

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