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Anomalous electrical resistivity associated with unconventional superconductivity in URu2Si2

Mar. 1, 2012

Joint Research group of JAEA and Osaka university have revealed anomalous electrical resistivity associated with unconventional superconductivity in the ‘hidden orderEstate in URu2Si2.

Unconventional superconductivity (SC) in the uranium compound URu2Si2 below Tsc = 1.4 K has attracted much attention due to its novel superconducting properties. The SC has a strong relation with the electronic state of an unknown ordered phase whose transition temperature is T0 = 17.5 K at ambient pressure. The nature of the ordered phase known as “hidden orderE(HO) has not been resolved for more than 25 years. The ground state is changed from the HO to the antiferromagnetic (AF) state at a first order phase transition pressure Px. as shown in Figure 1.

The research group conducted the precise electrical resistivity measurement under high pressure using ultra pure single crystal sample. The temperature dependence of ρ has been analyzed using the expression ρ = ρ + α1T + α2T2, assuming that the resistivity ρ consists of a T-linear resistivity from the unusual scattering process of electron and the usual T2-term. The research group finds a linearity between α12 and Tsc as shown in Figure 2. The pressure dependence of the coefficient α2 is very weak. This suggests that the anomalous electron scattering derives the unconventional SC in the hidden order phase. This finding provides a key for further studies on the HO and SC states in URu2Si2.

This work is published in the journal of American physical society “Physical Review BE(online, February 28th, 2012): “Strong correlation between anomalous quasiparticle scattering and unconventional superconductivity in the hidden-order phase of URu2Si2E N. Tateiwa, T. D. Matsuda, Y. Onuki, Y. Haga, and Z. Fisk, Physical Review B 85 054516 (2012).

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