Quantum Critical Behavior of Clean Itinerant Ferromagnets

Author

Thomas Vojta, Missouri University of Science and TechnologyFollow
Dietrich Belitz
Rajesh S. Narayanan
Theodore R. Kirkpatrick

Abstract

We consider the quantum ferromagnetic transition at zero temperature in clean itinerant electron systems. We find that the Landau-Ginzburg-Wilson order parameter field theory breaks down since the electron-electron interaction leads to singular coupling constants in the Landau-Ginzburg-Wilson functional. These couplings generate an effective long-range interaction between the spin or order parameter fluctuations of the form 1/r^2d-1, with d the spatial dimension. This leads to unusual scaling behavior at the quantum critical point in 1 < d ≤ 3, which we determine exactly. We also discuss the quantum-to-classical crossover at small but finite temperatures, which is characterized by the appearance of multiple temperature scales. A comparison with recent results on disordered itinerant ferromagnets is given.

Recommended Citation

T. Vojta et al., "Quantum Critical Behavior of Clean Itinerant Ferromagnets," Zeitschrift für Physik B Condensed Matter, vol. 103, no. 3-4, pp. 451 - 461, Springer Verlag, Apr 1997.

The definitive version is available at https://doi.org/10.1007/s002570050399

Department(s)

Physics

International Standard Serial Number (ISSN)

0722-3277

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 1997 Springer Verlag, All rights reserved.

Publication Date

01 Apr 1997