Singular Effects of Impurities near the Ferromagnetic Quantum-Critical Point

Details Singular Effects of Impurities near the Ferromagnetic Quantum-Critical Point Singular Effects of Impurities near the Ferromagnetic Quantum-Critical Point

2001-09-14

arxiv.org/abs/cond-mat/0109276v2

Phys. Rev. Lett. 88, 226403 (2002)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 2 figures

Scientific paper

10.1103/PhysRevLett.88.226403

Systematic theoretical results for the effects of a dilute concentration of magnetic impurities on the thermodynamic and transport properties in the region around the quantum critical point of a ferromagnetic transition are obtained. In the quasi-classical regime, the dynamical spin fluctuations enhance the Kondo temperature. This energy scale decreases rapidly in the quantum fluctuation regime, where the properties are those of a line of critical points of the multichannel Kondo problem with the number of channels increasing as the critical point is approached, except at unattainably low temperatures where a single channel wins out.

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