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Superconducting gap and pseudogap in near-optimally doped Bi2Sr2-xLaxCuO6+δ

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Lin,  C. T.
Scientific Facility Crystal Growth (Masahiko Isobe), Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Ren, J. K., Wei, Y. F., Yu, H. F., Tian, Y., Ren, Y. F., Zheng, D. N., et al. (2012). Superconducting gap and pseudogap in near-optimally doped Bi2Sr2-xLaxCuO6+δ. Physical Review B, 86(1): 014520.


Cite as: https://hdl.handle.net/21.11116/0000-000E-C28C-9
Abstract
We present a tunneling study of the superconducting gap and pseudogap from near optimally doped submicron Bi2Sr2-xLaxCuO6+delta intrinsic Josephson junctions whose self-heating is significantly suppressed. We find that as temperature decreases a pseudogap develops around T-star = 165 K while the superconducting gap starts to open at T-c0 = 40 K, which is well above the superconducting transition temperature T-c 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 T-c0.