Quantum Phase Transitions of Magnetic Rotons
- 16 July 2004
- journal article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 93 (3), 036405
- https://doi.org/10.1103/physrevlett.93.036405
Abstract
Because of weak spin-orbit coupling and broken inversion symmetry the paramagnons of an itinerant, almost ferromagnetic system become magnetic rotons. 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 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
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