Distinctive Features of Metal-Insulator Transitions, Multiscale Phase Separation, and Related Effects in Hole-Doped Cuprates

  • S. Dzhumanov Institute of Nuclear Physics, Uzbek Academy of Sciences
  • I. Khidirov Institute of Nuclear Physics, Uzbek Academy of Sciences
  • U. T. Kurbanov Institute of Nuclear Physics, Uzbek Academy of Sciences
  • Z. S. Khudayberdiev Institute of Nuclear Physics, Uzbek Academy of Sciences
  • J. Sh. Rashidov Institute of Nuclear Physics, Uzbek Academy of Sciences
Keywords: hole-doped cuprates, metal-insulator transitions, multiscale phase separation, doping-dependent electronic properties

Abstract

We study the distinctive features of the metal-insulator transitions, multiscale phase separation, and evolution of coexisting insulating and metallic/superconducting phases in hole-doped cuprates. We show how these interrelated phenomena and related effects manifest themselves in a wide doping range from the lightly doped to optimally doped regime in these systems, where the localized and mobile hole carriers reside in hole-poor (insulating) and hole-rich (metallic or superconducting) regions. We argue that small hole-rich regions (i.e. narrow nanoscale metallic islands or stripes) can persist in the insulating phase of the lightly doped cuprates, while the competing insulating, metallic, and superconducting phases would coexist in the under-doped cuprates. When the doping level is increased further, the hole-poor regions (or insulating zones) gradually narrow from macroscale to nanoscale insulating stripes and disappear in the optimally doped cuprates. We demonstrate clearly that the metal-insulator transitions and the coexisting insulating and metallic/superconducting phases are manifested in the suppression of superconductivity in underdoped cuprates and in the different temperature-dependent behaviors of the magnetic susceptibility and c-axis resistivity of lightly to optimally doped cuprates.

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Published
2019-05-16
How to Cite
Dzhumanov, S., Khidirov, I., Kurbanov, U., Khudayberdiev, Z., & Rashidov, J. (2019). Distinctive Features of Metal-Insulator Transitions, Multiscale Phase Separation, and Related Effects in Hole-Doped Cuprates. Ukrainian Journal of Physics, 64(4), 322. https://doi.org/10.15407/ujpe64.4.322
Section
Semiconductors and dielectrics