Observation of an oxygen isotope effect in superconducting (Y1−xPrx)Ba2Cu3O7−δ

J. P. Franck; J. Jung; M. A-K. Mohamed; S. Gygax; G. I. Sproule

doi:10.1103/PhysRevB.44.5318

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Observation of an oxygen isotope effect in superconducting (Y1−xPrx)Ba2Cu3O7−δ

J. P. Franck, J. Jung, M. A-K. Mohamed, S. Gygax, G. I. Sproule

DOI 10.1103/PhysRevB.44.5318 · Physical Review B

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Abstract

The oxygen isotope effect was studied in the system (Y1−xPrx)Ba2Cu3O7−δ for x=0.2, 0.3, 0.4, and 0.5. It is found that the oxygen isotope exponent α increases with increasing x and therefore decreasing transition temperature Tc. For the highest Pr concentrations α tends toward α=0.5. The value of the isotope exponent depends on the concentration of mobile holes. The lower this concentration is, the larger becomes the isotope exponent.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
(Y1-xPrx)Ba2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	91	Pressure not reported	unknown
YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	91	Pressure not reported	unknown
(Y0.8Pr0.2)Ba2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	71	Pressure not reported	zero_resistance
(Y0.7Pr0.3)Ba2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	60.4	Pressure not reported	zero_resistance
(Y0.6Pr0.4)Ba2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	46.2	Pressure not reported	zero_resistance
(Y0.5Pr0.5)Ba2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	30.6	Pressure not reported	zero_resistance
(Y0.8Pr0.2)Ba2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	71	Pressure not reported	onset
(Y0.7Pr0.3)Ba2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	60.4	Pressure not reported	onset
(Y0.6Pr0.4)Ba2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	46.2	Pressure not reported	onset
(Y0.5Pr0.5)Ba2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	30.6	Pressure not reported	onset
(Y0.75Pr0.2Ca0.05)Ba2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	73.6	Pressure not reported	zero_resistance
(Y0.7Pr0.2Ca0.1)Ba2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	77.8	Pressure not reported	zero_resistance
(Y0.6Pr0.2Ca0.2)Ba2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	71.2	Pressure not reported	zero_resistance