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 superconductivity in cuprates with a model charge-compensated CaxLa1- xBa1.75-xLa0.25+xCu3Oy (0≤x<0.5, y7.13) 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 / Sanna, Samuele; Agrestini, Stefano; Zheng, Kefei; De Renzi Roberto, ; Saini, Naurang. - In: EUROPHYSICS LETTERS. - ISSN 0295-5075. - STAMPA. - 86:6(2009), pp. 67007.670071-67007.670076. [10.1209/0295-5075/86/67007]
Experimental evidence of chemical-pressure-controlled superconductivity in cuprates
SANNA, SAMUELE;
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 superconductivity in cuprates with a model charge-compensated CaxLa1- xBa1.75-xLa0.25+xCu3Oy (0≤x<0.5, y7.13) 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 cupratesI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
