Magnetoresistance of Quasi Two-Dimensional Organic Conductors κ(BEDT-TSeF)_2FeX_4 (X=Cl, Br) and Mapping of Fermi Surface(Condensed matter : electronic structure and electrical, magnetic, and optical properties)

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We investigated an out-of-plane resistivity of quasi two-dimensional conductors, κ(BEDT-TSeF)_2-FeX_4(X=Cl, Br) which have an elliptical in-plane Fermi surface. The resistivity under a magnetic field parallel to conducting layers was found to obey a simple formula, ρ_<zz>(B, φ)=ρ_<zz>(0)√<1+(β(φ)B/ρ_<zz>(0))^2>, where B is a field strength and φ is an angle specifying the field direction. B(φ) is a parameter that is inversely proportional to the Fermi wave number in a direction normal to the magnetic field. We showed that we can map the in-plane Fermi surface, using φ dependence of β. This method is convenient because it works at high temperatures and in low magnetic fields where other methods to map the Fermi surface do not work.
社団法人日本物理学会の論文
2007-11-15