Isotope effects and possible pairing mechanism in optimally doped cuprate superconductors
Guo-meng Zhao, Vidula Kirtikar, Donald E. Morris
DOI 10.1103/PhysRevB.63.220506 · Physical Review B
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Abstract
We have studied the oxygen-isotope effects on Tc and in-plane penetration depth λab(0) in an optimally doped three-layer cuprate Bi1.6Pb0.4Sr2Ca2Cu3O10+y (Tc∼107 K). We find a small oxygen-isotope effect on Tc (αO=0.019), and a substantial effect on λab(0) [Δλab(0)/λab(0)=2.5±0.5%]. The present results along with the previously observed isotope effects in single-layer and double-layer cuprates indicate that the isotope exponent αO in optimally doped cuprates is small while the isotope effect on the in-plane effective supercarrier mass is substantial and nearly independent of the number of the CuO2 layers. A plausible pairing mechanism is proposed to explain the isotope effects, high-Tc superconductivity, and tunneling spectra in a consistent way.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi1.6Pb0.4Sr2Ca2Cu3O10+y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 107 | Pressure not reported | onset |
| YBa2Cu3O7-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 92 | Pressure not reported | unknown |
| La1.85Sr0.15CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| YBa2Cu3O6.94 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| YBa2Cu3O7-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | unknown |
| Bi2Sr2CaCu2O8-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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