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J. Phys. Soc. Jpn. 81 (2012) 023704 (4 pages)  |Previous Article| |Next Article|  |Table of Contents|
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Magnetic Exciton Mediated Superconductivity in the Hidden-Order Phase of URu2Si2

Hiroaki Kusunose

Department of Physics, Ehime University, Matsuyama 790-8577, Japan

(Received November 27, 2011; Accepted December 15, 2011; Published January 12, 2012)

We propose the magnetic exciton mediated superconductivity occurring in the enigmatic hidden-order phase of URu2Si2. The characteristic of the massive collective excitation observed only in the hidden-order phase is well reproduced by the antiferro hexadecapole ordering model as the trace of the dispersive crystalline-electric-field excitation. The disappearance of the superconductivity in the high-pressure antiferro magnetic phase can naturally be understood by the sudden suppression of the magnetic-exciton intensity. The analysis of the momentum dependence of the magnetic-exciton mode leads to the exotic chiral d-wave singlet pairing in the Eg symmetry. The Ising-like magnetic-field response of the mode yields the strong anisotropy observed in the upper critical field even for the rather isotropic three-dimensional Fermi surfaces of this compound. ©2012 The Physical Society of Japan

URL: http://jpsj.ipap.jp/link?JPSJ/81/023704/
DOI: 10.1143/JPSJ.81.023704


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