Isotope effect in YBa2−xLaxCu3Oz: Evidence for phonon-mediated high-temperature superconductivity

H. J. Bornemann; D. E. Morris

doi:10.1103/PhysRevB.44.5322

← Back to search

Isotope effect in YBa2−xLaxCu3Oz: Evidence for phonon-mediated high-temperature superconductivity

H. J. Bornemann, D. E. Morris

DOI 10.1103/PhysRevB.44.5322 · Physical Review B

T1

Active bibliographic source — not scientific approval

Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.

Abstract

We report the dependence of the oxygen isotope shift on transition temperature Tc in the system YBa2−xLaxCu3Oz with 0≤x≤0.5. We find a significant oxygen isotope shift at low temperatures (α0=0.38 at Tc=38.3 K), which decreases gradually with increasing Tc and finally falls rapidly above 73 K to α0=0.025 for Tc=92.3 K. Our data are well fitted by the expression α0(Tc)=0.5(1-Tc/Tc0)0.59, with Tc0=92.8 K. Our results suggest a dominant role for conventional electron-phonon coupling in the high-temperature cuprate superconductors, with strong suppression of the isotope effect as Tc approaches its maximum value in this system.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2-xLaxCu3Oz Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	92.3	Pressure not reported	onset
YBa2-xLaxCu3Oz Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	91.9	Pressure not reported	onset
YBa2-xLaxCu3Oz Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	77.3	Pressure not reported	onset
YBa2-xLaxCu3Oz Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	73	Pressure not reported	onset
YBa2-xLaxCu3Oz Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	60	Pressure not reported	onset
YBa2-xLaxCu3Oz Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	49.3	Pressure not reported	onset
YBa2-xLaxCu3Oz Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	38.3	Pressure not reported	onset
YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	92	Pressure not reported	unknown
La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Y1-xPrxBa2Cu3O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown