Wide-Field Imaging of Superconductor Vortices with Electron Spins in Diamond
Wide-Field Imaging of Superconductor Vortices with Electron Spins in Diamond
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DOI：
10.1103/physrevapplied.10.034032
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发表时间：
2018-03
影响因子：
4.6
通讯作者：
Y. Schlussel;Till Lenz;D. Rohner;Y. Bar-Haim;L. Bougas;D. Groswasser;M. Kieschnick;E. Rozenberg;L. Thiel;A. Waxman;J. Meijer;P. Maletinsky;D. Budker;R. Folman
中科院分区：
文献类型：
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作者：
Y. Schlussel;Till Lenz;D. Rohner;Y. Bar-Haim;L. Bougas;D. Groswasser;M. Kieschnick;E. Rozenberg;L. Thiel;A. Waxman;J. Meijer;P. Maletinsky;D. Budker;R. Folman
高Tc II型超导体的形成机制是凝聚态物理中的一个重要课题。进一步深入了解导致超导性的微观机制的一种方法是详细研究SC的磁性，例如通过研究涡旋的性质及其动力学。在这项工作中，我们描述了一种新的方法，宽场成像磁测量使用氮空位（NV）中心在金刚石图像的钇钡铜氧化物（YBCO）薄膜中的旋涡。我们演示了定量测定的磁场强度的涡旋杂散场，观察不同的冷却场的涡旋图案和直接观察我们的无序YBCO薄膜中的涡旋钉扎。该方法为在宽的温度范围内从DC到几兆赫的频率下对涡旋的杂散磁场进行成像开辟了前景，从而允许对高$T_{C}$和低$T_{C}$SC进行研究。NV中心磁强计允许的宽温度范围也使我们的方法适用于研究高温下的岛超导现象（例如金属纳米团簇）。
Understanding the mechanisms behind high-$T_{c}$ Type-II superconductors (SC) is still an open task in condensed matter physics. One way to gain further insight into the microscopic mechanisms leading to superconductivity is to study the magnetic properties of the SC in detail, for example by studying the properties of vortices and their dynamics. In this work we describe a new method of wide-field imaging magnetometry using nitrogen-vacancy (NV) centers in diamond to image vortices in an yttrium barium copper oxide (YBCO) thin film. We demonstrate quantitative determination of the magnetic field strength of the vortex stray field, the observation of vortex patterns for different cooling fields and direct observation of vortex pinning in our disordered YBCO film. This method opens prospects for imaging of the magnetic-stray fields of vortices at frequencies from DC to several megahertz within a wide range of temperatures which allows for the study of both high-$T_{C}$ and low-$T_{C}$ SCs. The wide temperature range allowed by NV center magnetometry also makes our approach applicable for the study of phenomena like island superconductivity at elevated temperatures (e.g. in metal nano-clusters).