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The quantum ferromagnetic transition of itinerant electrons is considered. It is shown that the Landau-Ginzburg-Wilson theory described by Hertz and others breaks down due to a singular coupling between fluctuations of the conserved order parameter. This coupling induces an effective long-range interaction between the spins of the form 1/r2d − 1. It leads to unusual scaling behavior at the quantum critical point in 1 < d ≤ 3 dimensions, which is determined exactly.
Journal | Data powered by TypesetEurophysics Letters |
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Publisher | Data powered by TypesetIOP Publishing |
ISSN | 02955075 |
Open Access | No |