Superconducting gap and pseudogap in near-optimally doped Bi2Sr2−xLaxCuO6+δ
J. K. Ren, Y. F. Wei, H. F. Yu, Ye Tian, Y. F. Ren, D. N. Zheng, S. P. Zhao, C. T. Lin
DOI 10.1103/PhysRevB.86.014520 · Physical Review B
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Abstract
We present a tunneling study of the superconducting gap and pseudogap from near optimally doped submicron Bi2Sr2−xLaxCuO6+δ intrinsic Josephson junctions whose self-heating is significantly suppressed. We find that as temperature decreases a pseudogap develops around T☆ = 165 K while the superconducting gap starts to open at Tc0 = 40 K, which is well above the superconducting transition temperature Tc of 30 K. We discuss the temperature-dependent properties of the superconducting phase and pseudogap phase. Our results demonstrate a clear two-gap feature of the system with precursor pairing up to Tc0.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr2-xLaxCuO6+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 30 | Pressure not reported | unknown |
| Bi2Sr1.6La0.4CuO6+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 30 | Pressure not reported | unknown |
| Bi2Sr2CaCu2O8+δ 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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