Nanoscale Interplay of Strain and Doping in a High-Temperature Superconductor

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• 作者：Ilija Zeljkovic ; Jouko Nieminen ; Dennis Huang ; Tay-Rong Chang ; Yang He ; Horng-Tay Jeng ; Zhijun Xu ; Jinsheng Wen ; Genda Gu ; Hsin Lin ; Robert S. Markiewicz ; Arun Bansil ; Jennifer E. Hoffman
• 刊名：Nano Letters
• 出版年：2014
• 出版时间：December 10, 2014
• 年：2014
• 卷：14
• 期：12
• 页码：6749-6753
• 全文大小：376K
• ISSN：1530-6992

文摘

The highest-temperature superconductors are electronically inhomogeneous at the nanoscale, suggesting the existence of a local variable that could be harnessed to enhance the superconducting pairing. Here we report the relationship between local doping and local strain in the cuprate superconductor Bi₂Sr₂CaCu₂O_8+x. We use scanning tunneling microscopy to discover that the crucial oxygen dopants are periodically distributed in correlation with local strain. Our picoscale investigation of the intraunit-cell positions of all oxygen dopants provides essential structural input for a complete microscopic theory.

Keywords:

High-T_c superconductors; cuprates; Bi₂Sr₂CaCu₂O_8+x; strain; scanning tunneling microscopy