Modification of the oxygen-isotope effect in high-temperature superconductors due to transition-metal doping

H. J. Bornemann; D. E. Morris; A. P. B. Sinha; M. R. Chandrachood; H. B. Liu

doi:10.1103/PhysRevB.48.9803

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Modification of the oxygen-isotope effect in high-temperature superconductors due to transition-metal doping

H. J. Bornemann, D. E. Morris, A. P. B. Sinha, M. R. Chandrachood, H. B. Liu

DOI 10.1103/PhysRevB.48.9803 · Physical Review B

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Abstract

We have investigated the effect on the oxygen-isotope-effect parameter α0 of transition-metal substitutions at the Cu sites in YBa2Cu3O7−δ (Y 1:2:3), YBa2Cu4O8 (Y 1:2:4), and Bi2Sr2CaCu2O8 compounds. The effects of the dopants are found to be quite diverse. In the case of Zn doping, α0 remains small in both Y 1:2:3 and Y 1:2:4 although Tc is rapidly depressed. On the other hand, doping with Fe or Ni has quite different effects in Y 1:2:3 and in Y 1:2:4. Our results suggest that the modification of the isotope effect depends upon the location of the dopant (Cu-O chains versus planes).

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	92	Pressure unresolved	onset
YBa2Cu4O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	80	Pressure unresolved	onset
Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	85	Pressure unresolved	onset