Nanoscale studies of cuprate superconductors in the current-carrying state

J. Y. T. Wei; J. Ngai; P. Morales

doi:10.1117/12.631743

30 August 2005 Nanoscale studies of cuprate superconductors in the current-carrying state

J. Y. T. Wei, J. Ngai, P. Morales

Proceedings Volume 5932, Strongly Correlated Electron Materials: Physics and Nanoengineering; 593210 (2005) https://doi.org/10.1117/12.631743
Event: Optics and Photonics 2005, 2005, San Diego, California, United States

Abstract

We present a new class of nanoscale experiments on cuprate superconductors in the current-carrying state. These experiments are aimed at studying how the high-T_c order parameter responds, in both real and reciprocal space, when driven by a sizable phase gradient. First, scanning tunneling spectroscopy was performed on current-carrying YBa₂Cu₃O_6+x (YBCO) thin-film strips, to reveal a remarkable suppression of the low-energy Andreev states indicating an increase in the local phase fluctuations. Second, transport measurements were made on optimally-doped YBCO nanostructures, to show anomalous current-voltage nonlinearities consistent with the formation of current-driven phase slip lines. These results are discussed in the general context of non-rigidity of the high-T_c order parameter under electrodynamic perturbation.

Citation Download Citation

J. Y. T. Wei, J. Ngai, and P. Morales "Nanoscale studies of cuprate superconductors in the current-carrying state", Proc. SPIE 5932, Strongly Correlated Electron Materials: Physics and Nanoengineering, 593210 (30 August 2005); https://doi.org/10.1117/12.631743

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