We argue that magnetic and angular oscillations observed in quasi-one-dimensional (Q1D) organic conductors represent a new type of many-body phenomena. The physical nature of such effects as "magic angles" in (TMTSF)2ClO4, (TMTSF)2PF6, and (DMET-TSeF)2 AuCl2 as well as "rapid magnetic oscillations" in (TMTSF)2ClO4 is shown to be beyond the standard theory of metals. Below we discuss an explanation of these phenomena which utilizes unusual many-body effect - a change of an effective dimensionality of electron-electron ("e-e") interactions with changing both a magnitude and a direction of a magnetic field. We show that some exotic transport properties of a metallic state can be interpreted in terms of these dimensional crossovers. We also demonstrate that magnetic field dependence of "e-e" interactions has to break Fermi liquid description of quasiparticles at high magnetic fields, H ≥ 25 - 30 T. This leads to the appearance of strong forbidden oscillations of magnetic susceptibility, δχ/χ0 ∼ 1-10, and magnetic moment, δM/M0 ∼ 0.1. All of the above mentioned unique properties of a metallic phase in (TMTSF)2X and (DMET-TSeF)AuCl2 allow us to call it an anomalous metallic phase.
ASJC Scopus subject areas
- Statistical and Nonlinear Physics