Strong Correlation between Anomalous Quasiparticle Scattering

and Unconventional  Superconductivity in Hidden Order Phase of URu2Si2

Naoyuki Tateiwa

Advanced Science Research Center, Japan Atomic Energy Agency, Japan


    The pressure dependent electrical resistivity of URu2Si2 has been studied at high pressure across the first order phase boundary of Px where the ground state switches under pressure from “hidden order” (HO) to large moment antiferromagnetic (LAFM)  states. The electrical transport in URu2Si2 at low temperatures shows a strong sample dependence. We have measured an ultra-clean single crystal whose quality is the highest among those used in previous studies. The generalized power law ρ=ρ0+AnTn analysis finds that the electric transport property deviates from Fermi liquid theory in the HO phase but obeys the theory well above Px. The analysis using the polynomial in T expression ρ=ρ0+α1T+α2T2 reveals that α1/α2 is proportional to Tsc in the HO phase. While the pressure dependence of α2 is very weak, α1 is roughly proportional to Tsc. This suggests a strong correlation between the anomalous quasiparticle scattering and the superconductivity and that both have a common origin. The present study clarifies a universality of the HO phase inherent in strongly correlated electron superconductors near quantum criticality.

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