Pseudogap and Conduction Dimensionalities in High-T_c Superconductors

Details Pseudogap and Conduction Dimensionalities in High-T_c Superconductors Pseudogap and Conduction Dimensionalities in High-T_c Superconductors

2002-03-07

arxiv.org/abs/cond-mat/0203164v8

Physica B 325 (2003) 164.

Physics

Condensed Matter

Superconductivity

To be published in Physica B

Scientific paper

10.1016/S0921-4526(02)01518-1

The nature of normal state charge-carriers' dynamics and the transition in conduction and gap dimensionalities between 2D and 3D for YBa_2 Cu_3 O_{7-delta} and Bi_2 Sr_2 Ca_{1-x} Y_x Cu_2 O_8 high-T_c superconductors were described by computing and fitting the resistivity curves, rho(T,delta,x). These were carried out by utilizing the 2D and 3D Fermi liquid (FL) and ionization energy (E_I) based resistivity models coupled with charge-spin (CS) separation based t-J model [Phys. Rev. B 64, 104516 (2001)]. rho(T,delta,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-delta) and Ca^{2+} (1-x) as such, c-axis pseudogap could be a different phenomenon from superconductor and spin gaps. These models also indicate that the recent MgB_2 superconductor is at least not Y123 or Bi2212 type.

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