| 报告题目 | Nonlinear Hall effect as a signature of electronic phase separation |
| 报告人 | Prof. Dr. Peng Xiong |
| 报告人单位 | Florida State University, USA |
| 报告时间 | 2013-06-20 |
| 报告地点 | 合肥微尺度物质科学国家实验室九楼会议室 |
| 主办单位 | 合肥微尺度物质科学国家实验室 |
| 报告介绍 | Abstract:
In this talk I will describe results of Hall effect measurements on several systems exhibiting magnetically driven percolative phase transitions. The talk will focus primarily on the semimetallic ferromagnet EuB6, in which we observed a distinctive switch in the Hall resistivity slope in the paramagnetic state. The switching fields in a broad temperature range were found to correspond to a single magnetization, which we interpret as the point of percolation for the phase-separated, magnetically-ordered, and electrically-conducting patches in the paramagnetic background [1]. We argue that this may be a general signature of electronic phase separation in materials with strong magneto-electronic correlations. We demonstrate its efficacy in anisotropically strained La2/3Ca1/3MnO3 by correlating the nonlinear features in the Hall effect with the emergence of antiferromagnetic insulating state in the materials. [1] X. Zhang et al., PRL 103, 106602 (2009). |
