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Strong correlation between anomalous quasiparticle scattering and unconventional superconductivity in the hidden-order phase of URu2Si2

  • Author(s): Tateiwa, N
  • Matsuda, TD
  • Onuki, Y
  • Haga, Y
  • Fisk, Z
  • et al.
Abstract

The pressure dependent electrical resistivity of URu2Si2has been studied at high pressure across the first order phase boundary of Pxwhere the ground state switches under pressure from "hidden order" (HO) to large moment antiferromagnetic (LAFM) states. The electrical transport in URu2Si2at low temperatures shows a strong sample dependence. We have measured an ultraclean 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 the relation α1/α2Tscin the HO phase. While the pressure dependence of α2is very weak, α1is 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. © 2012 American Physical Society.

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