Quantum phase transitions of magnetic rotons
Strongly Correlated Electrons
2009-11-10 v2 Statistical Mechanics
Abstract
Due to weak spin-orbit coupling, the magnetic excitations of an itinerant ferromagnet become magnetic rotons, excitations with degenerate minima on a hypersphere at finite wavevector. Using self-consistent Hartree and renormalization group calculations, we study weak fluctuation-driven first-order quantum phase transitions, a quantum tricritical point controlled by anisotropy and the non-Fermi liquid behavior associated with the large phase volume of magnetic rotons. We propose that magnetic rotons are essential for the description of the anomalous high-pressure behavior of the itinerant helical ferromagnet MnSi.
Keywords
Cite
@article{arxiv.cond-mat/0310186,
title = {Quantum phase transitions of magnetic rotons},
author = {Joerg Schmalian and Misha Turlakov and ;},
journal= {arXiv preprint arXiv:cond-mat/0310186},
year = {2009}
}
Comments
5 pages, 2 figures, revised version