Magic Angle Effects of One-Dimensional Axis Conductivity in Quasi-One-Dimensional Conductors

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  • Hasegawa Yasumasa
    Department of Material Science, Graduate School of Material Science, University of Hyogo
  • Kaneyasu Hirono
    Department of Material Science, Graduate School of Material Science, University of Hyogo
  • Kishigi Keita
    Faculty of Education, Kumamoto University

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In quasi-one-dimensional conductors, the conductivity in both the one-dimensional axis and interchain direction shows peaks when a magnetic field is tilted at the magic angles in the plane perpendicular to the conducting chain. Although there are several theoretical studies to explain the magic angle effect, no satisfactory explanation, especially for the one-dimensional conductivity, has been obtained. We present a new theory of the magic angle effect in the one-dimensional conductivity by taking account of the momentum dependence of the Fermi velocity, which should be large in the systems close to a spin density wave instability. The magic angle effect is explained in the semiclassical equations of motion, but neither the large corrugation of the Fermi surface due to long-range hoppings nor hot spots, where the relaxation time is small, on the Fermi surface are required.

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