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High-field metamagnetism in the antiferromagnet CeRh_2Si_2

机译：反铁磁体CeRh_2Si_2中的高场超磁性

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摘要

A study of the antiferromagnet CeRh_2Si_2 by torque, magnetostriction, and transport in pulsed magnetic fields up to 50 T and by thermal expansion in static fields up to 13 T is presented. The magnetic field temperature phase diagram of CeRh_2Si_2, where the magnetic field is applied along the easy axis c, is deduced from these measurements. The second-order phase transition temperature T_N and the first-order phase transition temperature T_(1,2)(=36 K and 26 K at zero field, respectively) decrease with increasing field. The field-induced antiferromagnetic-to-paramagnetic borderline H_c, which equals 26 T at 1.5 K, goes from first order at low temperature to second order at high temperature. The magnetic field temperature phase diagram is found to be composed of (at least) three different antiferromagnetic phases. These are separated by the first-order lines H_(1,2), corresponding to T_(1,2) at H=0, and H_(2,3), which equals 25.5 T at 1.5 K. A maximum of the T~2-coefficient A of the resistivity is observed at the onset of the high-field polarized regime, which is interpreted as the signature of an enhanced effective mass at the field-induced quantum instability. The magnetic field dependence of the A coefficient in CeRh_2Si_2 is compared with its pressure dependence, and also with the field dependence of A in the prototypal heavy-fermion system CeRu_2Si_2.
机译：提出了对反铁磁体CeRh_2Si_2的研究，该研究在高达50 T的脉冲磁场中通过转矩，磁致伸缩和传输，在高达13 T的静态磁场中通过热膨胀进行研究。从这些测量值推导出CeRh_2Si_2的磁场温度相位图，其中沿易轴c施加磁场。随着场的增加，二阶相变温度T_N和一阶相变温度T_（1,2）（分别在零场处分别为36 K和26 K）降低。场感应的反铁磁至顺磁边界线H_c在1.5 K时等于26 T，从低温的一阶变为高温的二阶。发现磁场温度相图由（至少）三个不同的反铁磁相组成。它们由对应于H = 0处的T_（1,2）的一阶线H_（1,2）和对应于1.5 K处的25.5 T的H_（2,3）隔开。T的最大值在高场极化方案开始时观察到电阻率的〜2系数A，这被解释为在场诱导的量子不稳定性下有效质量增加的标志。将CeRh_2Si_2中A系数的磁场依赖性与其压力依赖性进行了比较，还与原型重费米系统CeRu_2Si_2中A的磁场依赖性进行了比较。

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  • 来源
    《Physical review》 |2010年第9期|p.094403.1-094403.9|共9页
  • 作者

    W. Knafo; D. Aoki; D. Vignolles; B. Vignolle; Y. Klein; C. Jaudet; A. Villaume; C. Proust; J. Flouquet;

  • 作者单位

    Laboratoire National des Champs Magnetiques Menses, UPR 3228, CNRS-UJF-UPS-INSA, 143 Avenue de Rangueil, 31400 Toulouse, France;

    Institut Nanosciences et Cryogenie, SPSMS, CEA-Grenoble, 17 rue des Martyrs, 38054 Grenoble, France;

    Laboratoire National des Champs Magnetiques Menses, UPR 3228, CNRS-UJF-UPS-INSA, 143 Avenue de Rangueil, 31400 Toulouse, France;

    Laboratoire National des Champs Magnetiques Menses, UPR 3228, CNRS-UJF-UPS-INSA, 143 Avenue de Rangueil, 31400 Toulouse, France;

    Laboratoire National des Champs Magnetiques Menses, UPR 3228, CNRS-UJF-UPS-INSA, 143 Avenue de Rangueil, 31400 Toulouse, France;

    Laboratoire National des Champs Magnetiques Menses, UPR 3228, CNRS-UJF-UPS-INSA, 143 Avenue de Rangueil, 31400 Toulouse, France;

    Institut Nanosciences et Cryogenie, SPSMS, CEA-Grenoble, 17 rue des Martyrs, 38054 Grenoble, France;

    Laboratoire National des Champs Magnetiques Menses, UPR 3228, CNRS-UJF-UPS-INSA, 143 Avenue de Rangueil, 31400 Toulouse, France;

    Institut Nanosciences et Cryogenie, SPSMS, CEA-Grenoble, 17 rue des Martyrs, 38054 Grenoble, France;

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  • 正文语种 eng
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  • 关键词

    valence fluctuation, kondo lattice, and heavy-fermion phenomena; scattering mechanisms and kondo effect; antiferromagnetics;

    机译：价态波动;近藤晶格和重费米子现象;散射机制和近藤效应;反铁磁;

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