J. Phys. Soc. Jpn. 79, 094706 (2010) [4 Pages]
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Temperature Dependence of Energy Gap in the Superconducting State in URu2Si2

Frederic Bourdarot1, Elena Hassinger1, Stephane Raymond1, Dai Aoki1, Valentin Taufour1, and Jacques Flouquet1
+ Affiliations
1SPSMS, UMR-E 9001, CEA-INAC/UJF-Grenoble 1, 17 rue des martyrs, 38054 Grenoble, France
Received May 7, 2010; Accepted July 6, 2010; Published August 25, 2010

The excitation spectrum of URu 2 Si 2 in the superconducting state has been investigated by a precise neutron-scattering experiment. A weak but clear positive energy shift of ∼40 µeV has been detected in the superconducting phase (at T =400 mK) for the resonance at Q 0 = (1,0,0). For the resonance at 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 Q 0 is connected with the order parameters of the hidden order and of superconductivity.

©2010 The Physical Society of Japan
https://doi.org/10.1143/JPSJ.79.094706
KEYWORDS: URu2Si2, hidden order, magnetic resonance, superconductivity

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