Abstract
We investigate a theoretical problem of electron-electron interactions in an inclined magnetic field in a quasi-one-dimensional (Q1D) conductor. We show that they result in strong non-Fermi-liquid corrections to a specific heat, provided that the direction of the magnetic field is far from the so-called Lebed's magic angles (LMAs). If magnetic field is directed close to one of the LMAs, the specific heat corrections become small and the Fermi-liquid picture restores. As a result, we predict Fermi-liquid--non-Fermi-liquid angular crossovers in the vicinities of the LMA directions of the field. We suggest to perform the corresponding experiment in the Q1D conductor ${(\mathrm{Per})}_{2}\mathrm{Au}{(\mathrm{mnt})}_{2}$ under pressure in magnetic fields of the order of $H\ensuremath{\simeq}25\phantom{\rule{0.28em}{0ex}}\text{T}$.
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