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Breakdown of Landau-Ginzburg-Wilson theory for certain quantum phase transitions
Vojta T, Belitz D, , R Kirkpatrick T.
Published in IOP Publishing
Volume: 36
Issue: 3
Pages: 191 - 196

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.

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JournalData powered by TypesetEurophysics Letters
PublisherData powered by TypesetIOP Publishing
Open AccessNo