Magnetic quantum oscillations of the longitudinal conductivity σ_{zz} in quasitwodimensional metals
Abstract
We derive an analytical expression for the longitudinal magnetoconductivity σ_{zz} in layered conductors in presence of a quantizing magnetic field perpendicular to the layers and for shortrange inplane impurity scattering in frame of the quantum transport theory. Our derivation points out quite unusual temperature and magnetic field dependences for Shubnikovde Haas oscillations in the twodimensional limit, i.e., ħω_{c}>>4πt, where t is the interlayer hopping integral for electrons, and ω_{c} is the cyclotron frequency. In particular, when ħω_{c}>>4πt and ħω_{c}>=2πΓ_{μ} (here Γ_{μ} is the value of the imaginary part of the impurity selfenergy at the chemical potential μ), a pseudogap centered on integer values of μ/ħω_{c} appears in the zerotemperature magnetoconductivity function σ_{zz}(μ/ħω_{c}). At low temperatures, this highfield regime is characterized by a thermally activated behavior of the conductivity minima (when chemical potential μ lies between Landau levels) in correspondence with the recent observation in the organic conductor β''(BEDT TTF)_{2}SF_{5}CH_{2}CF_{2}SO_{3}.
 Publication:

Physical Review B
 Pub Date:
 November 2002
 DOI:
 10.1103/PhysRevB.66.195111
 arXiv:
 arXiv:condmat/0210302
 Bibcode:
 2002PhRvB..66s5111C
 Keywords:

 72.15.Gd;
 71.18.+y;
 Galvanomagnetic and other magnetotransport effects;
 Fermi surface: calculations and measurements;
 effective mass g factor;
 Condensed Matter
 EPrint:
 16 pages, 4 figures, to be published in Phys. Rev. B