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Hole redistribution across interfaces in superconducting cuprate superlattices (Articolo in rivista)

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Hole redistribution across interfaces in superconducting cuprate superlattices (Articolo in rivista) (literal)

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Aruta, C; Ghiringhelli, G; Dallera, C; Fracassi, F; Medaglia, PG; Tebano, A; Brookes, NB; Braicovich, L; Balestrino, G (2008)
Hole redistribution across interfaces in superconducting cuprate superlattices
in Physical review. B, Condensed matter and materials physics; APS, American physical society, College Park, MD (Stati Uniti d'America)
(literal)

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Aruta, C; Ghiringhelli, G; Dallera, C; Fracassi, F; Medaglia, PG; Tebano, A; Brookes, NB; Braicovich, L; Balestrino, G (literal)

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\"[Aruta, C.] Univ Naples Federico 2, Dipartimento Sci Fisiche, CNR INFM Coherentia, I-80126 Naples, Italy; [Ghiringhelli, G.] Politecn Milan, Dipartimento Fis, CNR INFM Coherentia, I-20133 Milan, Italy; [Ghiringhelli, G.; Fracassi, F.; Braicovich, L.] Politecn Milan, Dipartimento Fis, CNR INFM Soft, I-20133 Milan, Italy; [Dallera, C.] Politecn Milan, Dipartimento Fis, CNR INFM Ultras, I-20133 Milan, Italy; [Medaglia, P. G.; Tebano, A.; Balestrino, G.] Univ Roma Tor Vergata, Dipartimento Matemat, Dipartimento Ingn Meccan, CNR INFM Coherentia, I-00133 Rome, Italy; [Brookes, N. B.] European Synchrotron Radiat Facil, F-38043 Grenoble, France (literal)

Titolo

Hole redistribution across interfaces in superconducting cuprate superlattices (literal)

Abstract

With the aim of disentangling the role of the constituent blocks in the high-T-c cuprate superconductors we have measured x-ray absorption spectra at the Cu L-3 edge on (Cu1-delta C delta)Ba-2 CuOx (BCO), CaCuO2 (CCO), and BCO/CCO superconducting superlattices obtained by stacking in a sequence the two blocks. By observing the polarization dependence we could discriminate between the in-plane and out-of-plane hole densities. The results strongly indicate that charge is redistributed across the interfaces from the BCO charge reservoir block to the CCO infinite layer block. In the superconducting samples a relatively high density of out-of-plane holes is still present, whereas when the CCO layer thickness is excessive the holes appear to have preferential in-plane orientation and superconductivity is suppressed. (literal)

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