Abstract
It is shown that the phase diagram of a 2D metal with a varying charge carrier density consists of normal phase regions in which the modulus of the order parameter is zero, the so-called anomalously normal phase in which it differs from zero but has a random phase, and the Berezinskii–Kosterlitz–Thouless phase. The characteristic temperatures of transitions between these phases are determined as well as the behavior of the chemical potential as a function of the fermion density and temperature. An attempt is made to compare qualitatively the obtained phase diagram with the observed peculiarities in the behavior of underdoped high-Tc superconducting compounds above their critical temperature.
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