Anisotropic Kondo pseudo-gap in URu2Si2
arXiv:1805.11307 · doi:10.1103/PhysRevB.101.245103
Abstract
A polarized electronic Raman scattering study reveals the emergence of symmetry dependence in the electronic Raman response of single crystalline URuSi below the Kondo crossover scale . In particular, the development of a coherent Kondo pseudo-gap predominantly in the E channel highlights strong anisotropy in the Kondo physics in URuSi that has previously been neglected in theoretical models of this system. A calculation of the Raman vertices demonstrates that the strongest Raman vertex does indeed develop within the E channel for interband transitions and reaches a maximum along the diagonals of the Brillouin zone, implying a d-wave-like geometry for the Kondo pseudo-gap. Below the hidden order phase transition at , the magnitude of the pseudo-gap is found to be enhanced. Moreover, the anisotropy of the pseudo-gap is similar in form to that proposed for the chiral d-wave (E) superconducting state that appears below .
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