Angular dependence of magnetoresistance in strongly anisotropic quasitwodimensional metals: Influence of Landaulevel shape
Abstract
We present the quantummechanical calculation of the angular dependence of interlayer conductivity σ_{zz}(θ ) in a tilted magnetic field in quasitwodimensional (quasi2D) layered metals. Our calculation is applicable for arbitrary density of electron states and shows that the shape of Landau levels (LLs) is important for this angular dependence. We derive simple analytical formulas for σ_{zz}(θ ) in the particular cases of Gaussian and domeshaped LLs. Since in strongly anisotropic quasitwodimensional metals in a high magnetic field the LL shape is closer to domelike or Gaussian, this analytical formula replaces the traditionally used one, derived for Lorentzian LL shape. The amplitude of angular magnetoresistance oscillations (AMRO) is considerably stronger for the domelike or Gaussian than for the traditionally used Lorentzian LL shape. The ratio σ_{zz}(θ =0)/σ_{zz}(θ →±90^{∘}) is also several times smaller for the Lorentzian LL shape at the same LL width. The field dependence of σ_{zz}(θ →±90^{∘}) provides useful information about the electron mean free time. AMRO and Zeeman energy splitting lead to a spin current. For typical organic metals and for a medium magnetic field of 10 T this spin current is only a few percent of the charge current. However, the spin current may almost reach the charge current for special tilt angles of the magnetic field. The spin current has strong angular oscillations, which are phaseshifted as compared to the usual AMRO.
 Publication:

Physical Review B
 Pub Date:
 September 2014
 DOI:
 10.1103/PhysRevB.90.115138
 arXiv:
 arXiv:1309.3161
 Bibcode:
 2014PhRvB..90k5138G
 Keywords:

 72.15.Gd;
 73.43.Qt;
 74.70.Kn;
 74.72.h;
 Galvanomagnetic and other magnetotransport effects;
 Magnetoresistance;
 Organic superconductors;
 Cuprate superconductors;
 Condensed Matter  Strongly Correlated Electrons
 EPrint:
 8 pages, 3 figures