利用偏振克尔效应测量证明超导 La1.875Ba0.125Cuo4 单晶体中电荷有序相的手性有序。
Evidence of chiral order in the charge-ordered phase of superconducting La1.875Ba0.125Cuo4 single crystals using polar Kerr-effect measurements.
机构信息
Department of Applied Physics, Stanford University, Stanford, California 94305, USA and Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA.
Department of Physics and Astronomy, University of California, Irvine, California 92697-4575, USA.
出版信息
Phys Rev Lett. 2014 Jan 31;112(4):047003. doi: 10.1103/PhysRevLett.112.047003. Epub 2014 Jan 30.
High resolution polar Kerr effect measurements were performed on La1.875Ba0.125CuO4 single crystals revealing that a finite Kerr signal is measured below an onset temperature TK that coincides with the charge ordering transition temperature TCO. We further show that the sign of the Kerr signal cannot be trained with the magnetic field, is found to be the same on opposite sides of the same crystal, and is odd with respect to strain in the diagonal direction of the unit cell. These observations are consistent with a chiral "gyrotropic" order above Tc for La1.875Ba0.125CuO4; similarities to other cuprates suggest that it is a universal property in the pseudogap regime.
对 La1.875Ba0.125CuO4 单晶体进行了高分辨率的极角克尔效应测量，结果表明在起始温度 TK 以下测量到有限的克尔信号，该温度与电荷有序转变温度 TCO 重合。我们进一步表明，克尔信号的符号不能用磁场来训练，在同一晶体的相反两侧发现相同，并且相对于单位晶胞的对角方向的应变是奇数。这些观察结果与 La1.875Ba0.125CuO4 中超导温度以上的手性“旋光各向异性”有序一致；与其他铜酸盐的相似性表明，这是赝能隙区的普遍性质。
Zotero 插件