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Metal-insulator transitions and nanoscale phase separation in various underdoped cuprates

Number 3_Vol.2

AUTHORS: S. Dzhumanov, U.T. Kurbanov

DOI: 10.29317/ejpfm.2018020303

PAGES: 219 - 230

DATE: 2018-09-26


ABSTRACT

We demonstrate that the unconventional electron-phonon interactions, charge inhomogeneity and charge ordering in underdoped cuprates play an important role in metal-insulator transitions and nanoscale phase separation. In so doing, we argue that charge carriers (i.e. hole polarons) in these systems segregate into insulating (carrier-poor) and metallic/superconducting (carrier-rich) regions as a result of their speciļ¬c ordering. We show that the metal-insulator transitions, nanoscale phase separation and coexisting insulating and metallic/superconducting phases are manifested in the unusual temperature dependences of the magnetic susceptibility and resistivity and in the suppression of superconductivity in various underdoped cuprates.


KEYWORDS

Underdoped cuprate superconductors, phase separation, magnetic susceptibility, c -axis
charge transport.


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