The dependence of critical temperature on oxygen concentration in YBa2Cu3O6+x
in terms of the fragmented chain model

• Authors: Mirjana Milic , Vladimir Matic , Nenad Lazarov
• Languages of publication: EN

Abstracts

EN

An extended ASYNNNI model, that beside nearest-neighbour and next-nearest neighbour O-O interactions in the basal plane also includes interactions between the three nearest oxygen atoms, is used to describe the statistics of CuO chain fragmentation and to calculate doping and T
c in YBa2Cu3O6+x
. Calculations were made by the Monte Carlo method employing the recently proposed charge transfer model that assumes only chains whose length is equal to, or exceeds, a characteristic (critical) length, l
cr, can provide holes to the layers and contribute to doping p. The obtained p(x) is then combined with a universal T
c versus p relation to yield T
c(x) characteristics that correlate remarkably with those reported in recent experiments. The best coordination between theoretical and experimental T
c(x) characteristics has been achieved for l
cr = 2, implying that only isolated basal plane oxygen atoms (trivial chains) do not contribute holes to CuO2 layers.

Keywords

EN

superconductivity; charge transfer; CuO chains

• Publisher: De Gruyter Open
• Journal: Open Physics
• Year: 2011
• Volume: 9
• Issue: 3
• Pages: 690-697

Dates

published

1 - 6 - 2011

online

26 - 2 - 2011

Contributors

author

Mirjana Milic

• Laboratory of Theoretical Physics, Institute of Nuclear Sciences “Vinca”, P.O.Box 522, 11001, Belgrade, Serbia

author

Vladimir Matic

• Laboratory of Theoretical Physics, Institute of Nuclear Sciences “Vinca”, P.O.Box 522, 11001, Belgrade, Serbia

author

Nenad Lazarov

• Laboratory of Theoretical Physics, Institute of Nuclear Sciences “Vinca”, P.O.Box 522, 11001, Belgrade, Serbia

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Identifiers

DOI

10.2478/s11534-010-0060-6