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Journal of Superconductivity

, Volume 9, Issue 3, pp 329–333 | Cite as

Upper limit ofTc for the copper oxides

  • Vladimir Z. Kresin
  • Stuart A. Wolf
  • Yu. N. Ovchinnikov
Article

Abstract

The value of the critical temperature of the cuprates correlates with the doping level and is affected by the interplay of two competing factors: (1) the increase in carrier concentration, and (2) the pair-breaking effect of magnetic impurities. An analysis of the temperature dependence of the critical field leads to the conclusion that magnetic impurities are present even in a sample with the maximum observed value ofTc.

A new parameter, “intrinsic”Tc (Tcintr), which is its value in the absence of magnetic impurities, is introduced. The maximum value ofTcintr, which corresponds to the maximum doping level, appears to be similar for different cuprates and to be equal to 160–170 K. This is the upper limit ofTc in the cuprates.

Key words

Cuprates upper limit ofTc 

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Copyright information

© Plenum Publishing Corporation 1996

Authors and Affiliations

  • Vladimir Z. Kresin
    • 1
  • Stuart A. Wolf
    • 2
  • Yu. N. Ovchinnikov
    • 3
  1. 1.Lawrence Berkeley National LaboratoryUniversity of CaliforniaBerkeley
  2. 2.Naval Research LaboratoryWashington, DC
  3. 3.Landau Institute for Theoretical PhysicsMoscowRussia

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