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Phase diagram of MnSi (after Pfleider er et al 2001)

Non-Fermi-Liquid Behavior in Helical Magnets Dietrich Belitz, University of Oregon Eugene, DMR 0901952. In the helical magnet MnSi, a pronounced non-Fermi-liquid (NFL) behavior of the resistivity is observed in the paramagnetic phase: ρ ~ T 3/2 instead of the usual T 2 . Relevant Points:

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Phase diagram of MnSi (after Pfleider er et al 2001)

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  1. Non-Fermi-Liquid Behavior in Helical MagnetsDietrich Belitz, University of Oregon Eugene, DMR 0901952 • In the helical magnet MnSi, a pronounced non-Fermi-liquid (NFL) behavior of the resistivity is observed in the paramagnetic phase: ρ ~ T3/2 instead of the usual T2. • Relevant Points: • Scattering of electrons by collective excitations is the only conceivable mechanism for generic NFL transport behavior. • Very unusual properties of the collective excitations are necessary to produce ρ ~ T3/2. • Line-defect spin textures (skyrmions) have been observed in MnSi (Mühlbauer et al 2009). • Theoretical Explanation (Phys. Rev. Lett. 104, 256404 (2010)): • Fluctuations of a skyrmion lattice (skyrmionic sound waves) in conjunction with very weak quenched disorder leads to ρ ~ T3/2. Phase diagram of MnSi (after Pfleiderer et al 2001) Hexagonal lattice of line defects (green), and fluctuations about this state (red). • This mechanism works even if the skyrmion lattice has melted: Longitudinal sound waves survive. • Large fluctuations in a skyrmion fluid strongly enhance the prefactor of the T3/2. • Analogy to strong light scattering in Blue Phase III of chiral liquid crystals.

  2. Anomalous Pinning Fields in HelimagnetsDietrich Belitz, University of Oregon Eugene, DMR 0901952 Community Service: Education, and Development of Human Resources: • Kuan-Yuet Ho, graduate student • Yan Sang, graduate student Our collaborative research project supported by the two grants fosters close contact between our respective groups, with interactions between, and exchange of, students, postdocs, and visitors. Personnel currently supported by the grants: • PI Kirkpatrick serves as Divisional Associate Editor for Physical Review Letters, and as an editor for the electronic journal, JSTAT. • PI Belitz serves as Associate Editor for Condensed Matter Theory for Reviews of Modern Physics.

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