标题： 磁输运作为金属反铁磁体相变的探测手段：UIrSi$_3$的案例 显示英文标题

标题： Magnetotransport as a probe of phase transformations in metallic antiferromagnets: the UIrSi$_3$ case

摘要： 该文章测量了类似伊辛反铁磁体UIrSi3的电阻力、霍尔阻力和热电功率随温度和磁场的变化情况。我们观察到，一级和二级磁相变的明确不同特性分别在相应的临界温度和磁场附近导致了明显不同的磁输运特性。在反铁磁态中电阻力和霍尔阻力的磁贡献，以及顺磁态的极化和正常区域是由不同的基本机制驱动的。在三临界点附近的磁输运详细测量结果表明，霍尔阻力在相变时的步骤在此点改变极性。在一级元磁相变处，比热、电阻力、霍尔阻力和塞贝克系数的场依赖性跳跃表明发生了费米面重构，这是磁场所诱导的利什茨转变的特征。所呈现的结果强调了电输运和热输运性质测量在反铁磁体中作为探测磁相变的敏感探针的有用性，这些磁相变有时通过其他方法很难检测到。 显示英文摘要

摘要： The electrical resistance, Hall resistance and thermoelectric power of the Ising-like antiferromagnet UIrSi3 were measured as functions of temperature and magnetic field. We have observed that the unequivocally different characters of first-order and second-order magnetic phase transitions lead to distinctly different magnetotransport properties in the neighborhood of corresponding critical temperatures and magnetic fields, respectively. The magnetic contributions to the electrical and Hall resistivity in the antiferromagnetic state, and the polarized and normal regimes of paramagnetic state are driven by different underlying mechanisms. Results of detailed measurements of magnetotransport in the vicinity of the tricritical point reveal that the Hall-resistivity steps at phase transitions change polarity just at this point. The jumps in field dependences of specific heat, electrical resistivity, Hall resistivity and Seebeck coefficient at the first-order metamagnetic transitions indicate a Fermi surface reconstruction, which is characteristic of a magnetic-field induced Lifshitz transition. The presented results emphasize the usefulness of measurements of electrical- and thermal-transport properties as sensitive probes of magnetic phase transformations in antiferromagnets sometimes hardly detectable by other methods.