Overdoped cuprates with high-temperature superconducting transitions

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© 2013 AIP Publishing. This article may be downloaded for personal use only. Any other use requires prior permission of the authors and the American Institute of Physics. The following article appeared in APL Materials. Volume 1, Issue 2 and may be found at http://scitation.aip.org/content/aip/journal/aplmater/1/2/10.1063/1.4817895.

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Journal Title

Journal ISSN

Volume Title

School of Chemical Technology | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä

Date

2013

Major/Subject

Mcode

Degree programme

Language

en

Pages

021103/1-7

Series

APL Materials, Volume 1, Issue 2

Abstract

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 (Cu 0.75 Mo 0.25)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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Keywords

superconductivity, copper, molybdenum

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Citation

Marezio, M. & Chmaissem, O. & Bougerol, C. & Karppinen, Maarit & Yamauchi, H. & Geballe, T. H. 2013. Overdoped cuprates with high-temperature superconducting transitions. APL Materials. Volume 1, Issue 2. 021103/1-7. ISSN 2166-532X (printed). DOI: 10.1063/1.4817895.