Laboratoire Aimé Cotton, CNRS, Univ. Paris-Sud, ENS Paris-Saclay, Université Paris-Saclay, 91405 Orsay Cedex, France.
CEA, DAM, DIF, 91297 Arpajon, France.
Science. 2019 Dec 13;366(6471):1359-1362. doi: 10.1126/science.aaw4329.
Pressure can be used to tune the interplay among structural, electronic, and magnetic interactions in materials. High pressures are usually applied in the diamond anvil cell, making it difficult to study the magnetic properties of a micrometer-sized sample. We report a method for spatially resolved optical magnetometry based on imaging a layer of nitrogen-vacancy (NV) centers created at the surface of a diamond anvil. We illustrate the method using two sets of measurements realized at room temperature and low temperature, respectively: the pressure evolution of the magnetization of an iron bead up to 30 gigapascals showing the iron ferromagnetic collapse and the detection of the superconducting transition of magnesium dibromide at 7 gigapascals.
压力可以用来调整材料中结构、电子和磁相互作用的相互作用。通常在金刚石压腔中施加高压，这使得很难研究微米级样品的磁性。我们报告了一种基于成像金刚石压砧表面上形成的一层氮空位（NV）中心的空间分辨光学磁强计的方法。我们分别使用两组在室温下和低温下实现的测量结果来说明该方法：铁珠磁化强度随压力的变化高达 30 吉帕斯卡，显示出铁的铁磁塌陷，以及在 7 吉帕斯卡下检测到二溴化镁的超导转变。
