Chemical potential-electron density curve of the zigzag Hubbard ladder for Pr247

Abstract We investigate the filling dependence of the zigzag Hubbard ladder, which is a relevant model to the recently synthesized quasi-one-dimensional super conductor Pr 2 Ba 4 Cu 7 O 15 - δ (Pr247). Using the density matrix renormalization group method, we calculate chemical potential–electron density ( μ – ρ ) curve of the model and then discuss the relation between the oxygen-deficiency and transition temperature in Pr247.