测量 1.4Mbar 下液态铁的电阻率。

Measuring the Electrical Resistivity of Liquid Iron to 1.4 Mbar.

机构信息

Department of Earth and Planetary Sciences, Tokyo Institute of Technology, Tokyo 152-8551, Japan.

Japan Synchrotron Radiation Research Institute, SPring-8, Hyogo 679-5198, Japan.

出版信息

Phys Rev Lett. 2023 Jun 30;130(26):266301. doi: 10.1103/PhysRevLett.130.266301.

DOI:10.1103/PhysRevLett.130.266301

PMID:37450814

Abstract

We determined the electrical resistivity of liquid Fe to 135 GPa and 6680 K using a four-probe method in a diamond-anvil cell combined with two novel techniques: (i) enclosing a molten Fe in a sapphire capsule, and (ii) millisecond time-resolved simultaneous measurements of the resistance, x-ray diffraction, and temperature of instantaneously melted Fe. Our results show the minimal temperature dependence of the resistivity of liquid Fe and its anomalous resistivity decrease around 50 GPa, likely associated with a gradual magnetic transition, both in agreement with previous ab initio calculations.

摘要

我们使用四探针法在金刚石压腔中结合两种新技术（i）将熔融的铁封入蓝宝石胶囊，（ii）对即时熔化的铁的电阻、X 射线衍射和温度进行毫秒级时间分辨的同步测量，确定了 135 GPa 和 6680 K 下液态铁的电阻率。我们的结果表明液态铁的电阻率具有最小的温度依赖性，并且在约 50 GPa 处出现异常电阻率降低，可能与逐渐的磁转变有关，这与先前的 ab initio 计算结果一致。