Volume 86, Number 6, June 2009
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||03 July 2009|
Experimental evidence of chemical-pressure–controlled superconductivity in cuprates
Dipartimento di Fisica and CNISM, Università di Pavia - viale Bassi 6, 27100 Pavia, Italy, EU
2 Dipartimento di Fisica and CNISM, Università di Parma - viale Usberti 7A, 43100 Parma, Italy, EU
3 Laboratoire CRISMAT, UMR 6508, ENSICAEN-CNRS - Boulevard du Marechal Juin, 14050 Caen, France, EU
4 Dipartimento di Fisica, Università di Roma “La Sapienza” - P.le Aldo Moro 2, 00185 Roma, Italy, EU
Corresponding author: email@example.com
Accepted: 2 June 2009
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 CaxLaBaLaCu3Oy (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.
PACS: 74.72.-h – Cuprate superconductors (high-Tc and insulating parent compounds) / 74.62.Dh – Effects of crystal defects, doping and substitution / 78.70.Dm – X-ray absorption spectra
© EPLA, 2009
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