Critical local-moment fluctuations, anomalous exponents, and omega/T scaling in the Kondo problem with a pseudogap

Details Critical local-moment fluctuations, anomalous exponents, and omega/T scaling in the Kondo problem with a pseudogap Critical local-moment fluctuations, anomalous exponents, and omega/T scaling in the Kondo problem with a pseudogap

2001-09-21

arxiv.org/abs/cond-mat/0109417v3

Phys. Rev. Lett. 89, 076403 (2002)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures; enhanced figures, expanded discussion of small-r expansion

Scientific paper

10.1103/PhysRevLett.89.076403

Experiments in heavy-fermion metals and related theoretical work suggest that critical local-moment fluctuations can play an important role near a zero-temperature phase transition. We study such fluctuations at the quantum critical point of a Kondo impurity model in which the density of band states vanishes as |E|^r at the Fermi energy (E = 0). The local spin response is described by a set of critical exponents that vary continuously with r. For 0 < r < 1, the dynamical susceptibility exhibits omega/T scaling with a fractional exponent, implying that the critical point is interacting.

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