Phase slips and metastability in granular boron-doped nanocrystalline diamond microbridges
Phase slips and metastability in granular boron-doped nanocrystalline diamond microbridges
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DOI：
10.1016/j.carbon.2020.12.042
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发表时间：
2021-01
期刊：
影响因子：
10.9
通讯作者：
G. Klemencic;D. T. Perkins;Jonathan M. Fellows;C. Muirhead;Robert A. Smith;S. Mandal;Scott A. Manifold;Majdi Salman;Sean Giblin;Oliver A. Williams
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文献类型：
--
作者：
G. Klemencic;D. T. Perkins;Jonathan M. Fellows;C. Muirhead;Robert A. Smith;S. Mandal;Scott A. Manifold;Majdi Salman;Sean Giblin;Oliver A. Williams
相滑移是超导体相干性中的局部扰动，允许突然的2π相移。相滑移是一维超导体中普遍存在的特征，在二维超导体中也有类似的情况。在这里，我们展示了对掺硼纳米晶金刚石（BNCD）微桥的电输运测量，尽管它们具有三维宏观几何形状，但我们在电阻-温度和电压-电流特性中都发现了相滑移的明显证据。我们将这种行为归因于bcd不同寻常的微观结构。我们认为BNCD的柱状晶体结构形成了一个内在的约瑟夫森结阵列，支持微桥上的相滑移线。这些电桥中的电压状态是亚稳态的，我们证明了通过施加电磁噪声脉冲在不同超导状态之间进行确定性切换的能力。这种亚稳态与δ-MoN纳米线中观察到的亚稳态非常相似，但具有更大的响应电压。
A phase slip is a localized disturbance in the coherence of a superconductor allowing an abrupt 2π phase shift. Phase slips are a ubiquitous feature of one-dimensional superconductors and also have an analogue in two-dimensions. Here we present electrical transport measurements on boron-doped nanocrystalline diamond (BNCD) microbridges where, despite their three-dimensional macroscopic geometry, we find clear evidence of phase slippage in both the resistance-temperature and voltage-current characteristics. We attribute this behavior to the unusual microstructure of BNCD. We argue that the columnar crystal structure of BNCD forms an intrinsic Josephson junction array that supports a line of phase slippage across the microbridge. The voltage-state in these bridges is metastable and we demonstrate the ability to switch deterministically between different superconducting states by applying electromagnetic noise pulses. This metastability is remarkably similar to that observed in δ-MoN nanowires, but with a vastly greater response voltage.