Overdoped cuprates with high-temperature superconducting transitions

APL Materials - Tập 1 Số 2 - 2013
M. Marezio1, O. Chmaissem2,3, Catherine Bougerol4, Maarit Karppinen5, H. Yamauchi5, T. H. Geballe6
1CRETA/CNRS 1 , Grenoble 38042 cedex 9, France
2Argonne National Laboratory 3 Materials Science Division, , Argonne, Illinois 60439, USA
3Northern Illinois University 2 Physics Department, , DeKalb, Illinois 60115, USA
4Institut Néel 4 CEA-CNRS, , Grenoble 38042 cedex 9, France
5Aalto University 5 Department of Chemistry, , FI-00076 Aalto, Finland
6Stanford University 6 Department of Applied Physics and Materials Science, , Stanford, California 94305, USA

Tóm tắt

Evidence for high-Tc cuprate superconductivity is found in a region of the phase diagram where non-superconducting Fermi liquid metals are expected. Cu valences estimated independently from both x-ray absorption near-edge spectroscopy and bond valence sum measurements are >2.3, and are in close agreement with each other for structures in the homologous series (Cu0.75Mo0.25)Sr2(Y,Ce)sCu2O5+2s+δ with s = 1, 2, 3, and 4. The record short apical oxygen distance, at odds with current theory, suggests the possibility of a new pairing mechanism. The possibility that the charge reservoir layers are able to screen long range coulomb interactions and thus enhance Tc is discussed.

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