Suppression of superconductivity at the nanoscale in chemical solution derived YBa2Cu3O7−δ thin films with defective Y2Ba4Cu8O16 intergrowths,Nanoscale Advances

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Suppression of superconductivity at the nanoscale in chemical solution derived YBa2Cu3O7−δ thin films with defective Y2Ba4Cu8O16 intergrowths
Nanoscale Advances ( IF 4.6 ) Pub Date : 2020-06-24 , DOI: 10.1039/d0na00456a
Ziliang Li ₁ , Mariona Coll ₁ , Bernat Mundet ₁ , Anna Palau ₁ , Teresa Puig ₁ , Xavier Obradors ₁

Affiliation

The analysis of the microstructure and superconducting behavior of chemical solution deposited epitaxial YBa₂Cu₃O_7−δ films, with thickness going down to 5 nm has been carried out with the purpose to disclose the behavior of the most common intergrowth in these films, the Y₂Ba₄Cu₈O₁₆. The analysis of ultrathin films is a unique opportunity to investigate the superconducting behavior of these nanoscale defects because of the high concentration created as a consequence of the elastic energy associated to the misfit strain. Magnetic susceptibility and X-ray diffraction measurements evidence a strong decrease of the superconducting volume correlated with an increase of the intergrowth volume fraction. We demonstrate that these intergrowths are non-superconducting nanoscale regions where Cooper pair formation is disrupted, in agreement with their key role as artificial pinning centers for vortices in YBa₂Cu₃O_7−δ films and coated conductors.

中文翻译：

在化学溶液中抑制纳米尺度的超导性得到 YBa2Cu3O7-δ 薄膜，具有缺陷的 Y2Ba4Cu8O16 共生

对厚度低至 5 nm的化学溶液沉积外延 YBa ₂ Cu ₃ O _{7- δ}薄膜的微观结构和超导行为进行了分析，目的是揭示这些薄膜中最常见的共生行为， Y ₂ Ba ₄ Cu ₈ O ₁₆. 超薄膜的分析是研究这些纳米级缺陷的超导行为的独特机会，因为与错配应变相关的弹性能量会产生高浓度。磁化率和 X 射线衍射测量表明超导体积的强烈减少与共生体积分数的增加相关。我们证明这些共生是非超导纳米级区域，其中库珀对的形成被破坏，这与它们作为 YBa ₂ Cu ₃ O _{7- δ}薄膜和涂层导体中涡流的人工钉扎中心的关键作用一致。

更新日期：2020-08-11

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