Journal de Physique IV

Issue		J. Phys. IV France Volume 114, April 2004
Page(s)		77 - 80
DOI		10.1051/jp4:2004114014

J. Phys. IV France 114 (2004) 77
DOI: 10.1051/jp4:2004114014

Magic angles, AMRO and interference effects in layered conductors

A.G. Lebed^{1, 2}, N.N. Bagmet¹ and M.J. Naughton¹

¹ Department of Physics, Boston College, Chestnut Hill, MA 02467, USA
e-mail: lebed@bc.edu
² Landau Institute for Theoretical Physics, 2 Kosygina Street, Moscow, Russia

Abstract
We analytically solve kinetic equation in the extended Brillouin zone and demonstrate that the interference effects which occur as electrons move along open orbits result in the appearance of Magic Angle (MA) minima of resistivity. A comparison of our theory with MA phenomena observed in resitivity component $\rho_{\perp}(H, \alpha)$ , perpendicular to conducting layers in (TMTSF) ₂X and $\alpha$ -(BEDT-TTF) ₂MHg(SCN) ₄ conductors, shows a good qualitative agreement, including the first explanation why MA's with large indexes, N > 1, are observed in (TMTSF) ₂X (X = ClO ₄ and PF ₆) and $\alpha$ -(BEDT-TTF) ₂MHg(SCN) ₄ compounds. Both physical meaning of the above mentioned interference effects and mathematical expressions for $\rho_{\perp}(H, \alpha)$ are different from that in a so-called OsadaÕs model. Key words. Organic conductors - Magic angles - Quantum oscillations

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