| Issue |
Europhys. Lett.
Volume 36, Number 3, October III 1996
|
|
|---|---|---|
| Page(s) | 191 - 196 | |
| Section | Condensed matter: structure, thermal and mechanical properties | |
| DOI | https://doi.org/10.1209/epl/i1996-00208-x | |
| Published online | 01 September 2002 | |
Breakdown of Landau-Ginzburg-Wilson theory for certain quantum phase transitions
1
Department of Physics and Materials Science Institute, University of Oregon,
Eugene, OR 97403, USA
2
Institute for Physical Science and Technology, and Department of Physics,
University of Maryland - College Park, MD 20742, USA
Received:
10
June
1996
Accepted:
10
September
1996
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
. It leads to unusual scaling behavior at the quantum critical
point in 
dimensions, which is determined exactly.
PACS: 64.60.Ak – Renormalization-group, fractal, and percolation studies of phase transitions / 75.10.Jm – Quantized spin models / 75.40.-s – Critical-point effects, specific heats, short-range order
© EDP Sciences, 1996
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