Enhancement of oxygen isotope effect due to out-of-plane disorder in Bi2Sr2Ln0.4CuO6+δ superconductors
K. Sato, H. Iwasawa, N. C. Plumb, T. Masui, Y. Yoshida, H. Eisaki, H. Bando, A. Ino, M. Arita, K. Shimada, H. Namatame, M. Taniguchi, S. Tajima, Y. Nishihara, D. S. Dessau, Y. Aiura
DOI 10.1103/PhysRevB.80.212501 · Physical Review B
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Abstract
The disorder dependence of the oxygen isotope effect in optimally doped Bi2Sr1.6Ln0.4CuO6+δ superconductors which is introduced into cation sites in the planes adjacent to CuO2 planes is studied. The degree of out-of-plane disorder is controlled by substituting Ln ions with different ionic radii from La to Gd. This type of disorder does not explicitly alter the nodal electronic structure or the underlying Fermi surface but markedly enhances the oxygen isotope exponent at the superconducting transition temperature (αTc). The enhancement in αTc is well explained by the pair-breaking model, suggesting the growth of a pseudogap state around the antinodal region due to the out-of-plane disorder.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr1.6La0.4CuO6+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 32.83 | Pressure not reported | onset |
| Bi2Sr1.6Nd0.4CuO6+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 30.07 | Pressure not reported | onset |
| Bi2Sr1.6Eu0.4CuO6+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 16.9 | Pressure not reported | onset |
| Bi2Sr1.6Gd0.4CuO6+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 12.27 | Pressure not reported | onset |
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