Pair suppression caused by mosaic-twist defects in superconducting Sr2RuO4 thin-films prepared using pulsed laser deposition

Pair suppression caused by mosaic-twist defects in superconducting Sr2RuO4 thin-films prepared using pulsed laser deposition
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脉冲激光沉积制备的超导 Sr2RuO4 薄膜中马赛克扭曲缺陷引起的对抑制

DOI:
10.1038/s43246-020-0026-1
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发表时间:
2020
影响因子:
7.8
通讯作者:
Garcia C
Garcia C
中科院分区:
--
文献类型:
--
作者:
Garcia C

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Sr2RuO4(SRO214)是一种典型的非常规超导体。然而,自从它的超导电性在25年前被发现以来,单晶SRO214中体超导态和表面超导态的对称性一直存在争议。由于结构缺陷和杂质敏感地湮没超导电性,超导SRO214在薄膜中的实现具有极大的挑战性,这一事实极大地阻碍了这个问题的解决。在这里,我们报道了一种利用脉冲激光沉积技术可靠地生长超导薄膜的方案,并确定了对超导状态具有破坏性的普遍材料性质。我们证明,为了实现超导电性和使用单晶靶Sr3Ru2O7(SRO327),仔细控制起始材料是必不可少的。通过系统地改变SRO_(214)薄膜的厚度,我们发现马赛克扭曲是抑制超导电性的关键面内缺陷。这一结果对发展非常规超导电性至关重要。
Sr2RuO4(SRO214) is a prototypical unconventional superconductor. However, since the discovery of its superconductivity a quarter of a century ago, the symmetry of the bulk and surface superconducting states in single crystal SRO214remains controversial. Solving this problem is massively impeded by the fact that superconducting SRO214is extremely challenging to achieve in thin-films as structural defects and impurities sensitively annihilate superconductivity. Here we report a protocol for the reliable growth of superconducting SRO214thin-films by pulsed laser deposition and identify universal materials properties that are destructive to the superconducting state. We demonstrate that careful control of the starting material is essential in order to achieve superconductivity and use a single crystal target of Sr3Ru2O7(SRO327). By systematically varying the SRO214film thickness, we identify mosaic twist as the key in-plane defect that suppresses superconductivity. The results are central to the development of unconventional superconductivity.
DOI: --
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