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Phys Rev Lett. 2004 Jul 16;93(3):036405. Epub 2004 Jul 16.

Quantum phase transitions of magnetic rotons.

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1
Department of Physics and Astronomy and Ames Laboratory, Iowa State University, Ames, Iowa 50011, USA.

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.

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