Pseudogap and conduction dimensionalities in high-Tc superconductors
Abstract
The nature of normal state charge-carriers' dynamics and the transition in conduction and gap dimensionalities between 2D and 3D for YBa2Cu3O7-δ and Bi2Sr2Ca1- xYxCu2O8 high-Tc superconductors were described by computing and fitting the resistivity curves, /ρ(T,δ,x). These were carried out by utilizing the 2D and 3D Fermi liquid and ionization energy (EI) based resistivity models coupled with charge-spin separation based /t-/J model (Phys. Rev. B 64 (2001) 104516). /ρ(T,δ,x) curves of Y123 and Bi2212 samples indicate the beginning of the transition of conduction and gap from 2D to 3D with reduction in oxygen content /(7-δ) and Ca2+(1-x) as such, /c-axis pseudogap could be a different phenomenon from superconductor and spin gaps. These models also indicate that the recent MgB2 superconductor is at least not Y123 or Bi2212 type.
- Publication:
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Physica B Condensed Matter
- Pub Date:
- January 2003
- DOI:
- 10.1016/S0921-4526(02)01518-1
- arXiv:
- arXiv:cond-mat/0203164
- Bibcode:
- 2003PhyB..325..164D
- Keywords:
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- Condensed Matter - Superconductivity;
- Condensed Matter - Statistical Mechanics
- E-Print:
- To be published in Physica B