X-ray absorption spectroscopy (XAS) and high-resolution X-ray diffraction are combined to study the interplay between electronic and lattice structures in controlling the super- conductivity in cuprates with a model charge-compensated CaxLa1−xBa1.75−xLa0.25+xCu3Oy (0 x < 0.5, y ≈ 7.13) system. In spite of a large change in Tc, the doped holes, determined by the Cu L and O K XAS, hardly show any variation with the x. On the other hand, the CuO2 plaquette size shows a systematic change due to different size of substituted cations. The results provide a direct evidence for the chemical pressure being a key parameter for controlling the superconducting ground state of the cuprates.
Experimental evidence of chemical-pressure–controlled superconductivity in cuprates / S., Sanna; S., Agrestini; K., Zheng; R., DE RENZI; Saini, Naurang Lal. - In: EUROPHYSICS LETTERS. - ISSN 0295-5075. - 86:(2009), pp. 67007-p1-67007-p6. [10.1209/0295-5075/86/67007]
Experimental evidence of chemical-pressure–controlled superconductivity in cuprates
SAINI, Naurang Lal
2009
Abstract
X-ray absorption spectroscopy (XAS) and high-resolution X-ray diffraction are combined to study the interplay between electronic and lattice structures in controlling the super- conductivity in cuprates with a model charge-compensated CaxLa1−xBa1.75−xLa0.25+xCu3Oy (0 x < 0.5, y ≈ 7.13) system. In spite of a large change in Tc, the doped holes, determined by the Cu L and O K XAS, hardly show any variation with the x. On the other hand, the CuO2 plaquette size shows a systematic change due to different size of substituted cations. The results provide a direct evidence for the chemical pressure being a key parameter for controlling the superconducting ground state of the cuprates.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
