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Soft x-ray absorption and high-resolution powder x-ray diffraction study of superconducting CaxLa1-xBa1.75-xLa0.25+xCu3Oy system

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Agrestini,  S.
Stefano Agrestini, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Agrestini, S., Sanna, S., Zheng, K., De Renzi, R., Pusceddu, E., Concas, G., et al. (2014). Soft x-ray absorption and high-resolution powder x-ray diffraction study of superconducting CaxLa1-xBa1.75-xLa0.25+xCu3Oy system. Journal of Physics and Chemistry of Solids, 75(2), 259-264. doi:10.1016/j.jpcs.2013.09.026.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0017-C26E-C
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.