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Pressure tuning of structural and magnetic transitions in EuAg_4As_2

机译：EUAG_4AS_2中结构和磁过渡的压力调谐

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摘要

We report temperature-dependent measurements of ambient-pressure specific heat, magnetic susceptibility, anisotropic resistivity, and thermal expansion as well as in-plane resistivity under pressure up to 20.8 kbar on single crystals of EuAg_4As_2, Based on thermal expansion and in-plane electrical transport measurements at ambient pressure this compound has two, first-order, structural transitions in the 80-120 K temperature range. Ambient-pressure specific heat, magnetization, and thermal expansion measurements show a cascade of up to seven transitions between 8 and 16 K associated with the ordering of the Eu~(2+) moments. In-plane electrical transport is able to detect the more prominent of these transitions, at 15.5,9.9, and 8.7 K, as well as a weak feature at 11.8 K at ambient pressure. Pressure-dependent electrical transport data show that the magnetic transitions shift to higher temperatures under pressure, as does the upper structural transition, whereas the lower structural transition is suppressed and ultimately vanishes. A jump in resistivity, associated with the upper structural transition, decreases under pressure with an extrapolated disappearance (or a change of sign) by 30-35 kbar. In the 10-15 kbar range a kink in the pressure dependency of the upper structural transition temperature as well as the high- and low-temperature in-plane resistivities suggests that a change in the electronic structure may occur in this pressure range. The results are compared with the literature data for SrAg_4As_2.
机译：基于热膨胀和面内电气，我们报告环境压力比热，磁化率，各向异性电阻率和热膨胀以及热膨胀的温度依赖性测量以及在高达20.8 kbar的压力下的面内电阻率。环境压力下的运输测量该化合物具有两次，一流的结构转变，在80-120K温度范围内。环境压力比热，磁化和热膨胀测量显示了与欧盟〜（2+）矩的排序相关的8至16 k之间的级联高达七个过渡。在平面内电传输能够检测这些过渡的更突出，在15.5,9.9和8.7k，以及在环境压力下为11.8k的弱特征。压力依赖的电气传输数据表明，磁过渡在压力下变为较高的温度，如上结构转变，较低的结构转变被抑制并最终消失。与上部结构过渡相关的电阻率跳跃，在压力下减少，其外推消失（或符号变化）到30-35 kbar。在10-15 kbar范围内，在上部结构转变温度以及高温面内电阻的压力依赖性中的扭结表明，在该压力范围内可能发生电子结构的变化。将结果与SRAG_4AS_2的文献数据进行比较。

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  • 来源
    《Physical review》 |2020年第19期|195112.1-195112.8|共8页
  • 作者

    Sergey L. Budko; Li Xiang; Chaowei Hu; Bing Shen; Ni Ni; Paul C. Canfield;

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    Amex laboratory U.S. Department of Energy and Department of Physics and Astronomy Iowa State University Ames Iowa 50011 USA;

    Amex laboratory U.S. Department of Energy and Department of Physics and Astronomy Iowa State University Ames Iowa 50011 USA;

    Department of Physics and Astronomy and California NanoSystems Institute University of California Los Angeles Los Angeles California 90095 USA;

    Department of Physics and Astronomy and California NanoSystems Institute University of California Los Angeles Los Angeles California 90095 USA;

    Department of Physics and Astronomy and California NanoSystems Institute University of California Los Angeles Los Angeles California 90095 USA;

    Amex laboratory U.S. Department of Energy and Department of Physics and Astronomy Iowa State University Ames Iowa 50011 USA;

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