Co-existence of Fermi and Charge-Spin Separated Liquids in High-Tc Superconductors

The 2-dimensional (2D) Hybrid theory obtained from the coupling of ionization energy (EI) based Fermi liquid (FL) resistivity model in c-axis and resonating-valence-bond (RVB) based effective t-J model is used to analyse the Hall resistances (R (ab) H , R (c) H ) of optimally doped as well as oxygen-deficient YBa2Cu3O7−δ single crystals. It is shown that R (ab) H ∝ 1/T and R (c) H is independent of temperature (T ) if the condition, ∆PG (c-axis Pseudogap) < T ∗ (Spin gap characteristic temperature) < Tc < T is satisfied. R (a) H , R (b) H and R (c) H models as a function of T , T ∗ and ∆PG are utilized to further reinforce the inevitability of 2D Fermi and charge-spin separated (F-CSS) liquids for the characterization of electrical properties in the normal state of high-Tc superconductors (NS-HTSC), particularly for YBa2Cu3O7−δ. PACS Number(s): 73.43.-f; 74.72.Bk; 71.10.Ay; 72.60.+g Typeset using REVTEX ∗E-mail: [email protected]