کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5788998 1414286 2016 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Nodeless pairing in superconducting copper-oxide monolayer films on Bi2Sr2CaCu2O8+δ
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Nodeless pairing in superconducting copper-oxide monolayer films on Bi2Sr2CaCu2O8+δ
چکیده انگلیسی
The pairing mechanism of high-temperature superconductivity in cuprates remains the biggest unresolved mystery in condensed matter physics. To solve the problem, one of the most effective approaches is to investigate directly the superconducting CuO2 layers. Here, by growing CuO2 monolayer films on Bi2Sr2CaCu2O8+δ substrates, we identify two distinct and spatially separated energy gaps centered at the Fermi energy, a smaller U-like gap and a larger V-like gap on the films, and study their interactions with alien atoms by low-temperature scanning tunneling microscopy. The newly discovered U-like gap exhibits strong phase coherence and is immune to scattering by K, Cs and Ag atoms, suggesting its nature as a nodeless superconducting gap in the CuO2 layers, whereas the V-like gap agrees with the well-known pseudogap state in the underdoped regime. Our results support an s-wave superconductivity in Bi2Sr2CaCu2O8+δ, which, we propose, originates from the modulation-doping resultant two-dimensional hole liquid confined in the CuO2 layers.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Science Bulletin - Volume 61, Issue 16, August 2016, Pages 1239-1247
نویسندگان
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