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Abstract:
We have studied the electronic structure of unoccupied states measured
by 0 K-edge and Cu L-edge x-ray absorption spectroscopy (XAS), combined
with crystal structure studied by high resolution powder x-ray
diffraction (HRPXRD), of charge-compensated layered superconducting
CaxLa1-xBa1.75-xCu3Oy,(0 <= x <= 0.4 and 6.4 <= y <= 7.3) cuprate. A
detailed analysis shows that, apart from hole doping, chemical pressure
on the electronically active CuO2 plane due to the lattice mismatch with
the spacer layers greatly influences the superconducting properties of
this system. The results suggest chemical pressure to be the most
plausible parameter to control the maximum critical temperatures
(T-c(max)) in different cuprate families at optimum hole density. (C)
2013 Elsevier Ltd. All rights reserved.
