Nonlinear conductivity in CaRuO3 thin films measured by short current pulses

Abstract

Metals near quantum critical points have been predicted to display universal out-of equilibrium behavior in the steady current-carrying state. We have studied the non-linear conductivity of high-quality CaRuO${}_3$ thin films with residual resistivity ratio up to 57 using micro-second short, high-field current pulses at low temperatures. Even for the shortest pulses of $5\mu$s, Joule heating persists, making it impossible to observe a possible universal non-linearity. Much shorter pulses are needed for the investigation of universal non-linear conductivity.

9 pages, 7 figures

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• Quantum Criticality in Heavy Fermion Metals
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Cited by in corpus (2)

• Strong terahertz third-harmonic generation by kinetic heavy quasiparticles in CaRuO${}_3$
• Non-linear quantum critical dynamics and fluctuation-dissipation ratios far from equilibrium