Magnetic Exciton Mediated Superconductivity in the Hidden-Order Phase of URu2Si2

Details Magnetic Exciton Mediated Superconductivity in the Hidden-Order Phase of URu2Si2 Magnetic Exciton Mediated Superconductivity in the Hidden-Order Phase of URu2Si2

2011-08-23

arxiv.org/abs/1108.4638v2

J. Phys. Soc. Jpn. 81 (2012) 023704

Physics

Condensed Matter

Superconductivity

5 pages, 4 figures

Scientific paper

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 3-dimensional Fermi surfaces of this compound.

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