Temperature Dependence of Energy Gap in the Superconducting State in URu2Si2

概要

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The excitation spectrum of URu2Si2 in the superconducting state has been investigated by a precise neutron-scattering experiment. A weak but clear positive energy shift of ${\sim}40$ μeV has been detected in the superconducting phase (at $T=400$ mK) for the resonance at $\mathbf{Q}_{0} = (1,0,0)$. For the resonance at $\mathbf{Q}_{1} = (0.6,0,0)$, a two times smaller shift is observed but with an incertitude of the same order than this shift. This result is in agreement with our previous results indicating that the wave-vector $\mathbf{Q}_{0}$ is connected with the order parameters of the hidden order and of superconductivity.
2010-09-15