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Cascade of field-induced magnetic transitions in a frustrated antiferromagnetic metal

机译:沮丧的反铁磁金属中的磁场感应磁跃迁的级联

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摘要

Frustrated magnets can exhibit many novel forms of order when exposed to high magnetic fields. Much less, however, is known about materials where frustration occurs in the presence of itinerant electrons. Here we report thermodynamic and transport measurements on micron-size single crystals of the triangular-lattice metallic antiferromagnet 2H-AgNiO_2, in magnetic fields of up to 90 T and temperatures down to 0.35 K. We observe a cascade of magnetic phase transitions at 13.5, 20, 28, and 39 T in fields applied along the easy axis, and we combine magnetic torque, specific heat, and transport data to construct the field-temperature phase diagram. The low-field experimental data are compared with theoretical calculations for a frustrated easy-axis Heisenberg model based on realistic parameters for the localized moments of AgNiO_2. Deviations from this model's predictions are attributed to the role played by the itinerant electrons.
机译:受挫的磁体在强磁场中会表现出许多新颖的有序形式。然而,对于在流动电子的存在下会产生挫折感的材料知之甚少。在这里,我们报告了在高达90 T的磁场和低至0.35 K的温度下,对三角形晶格金属反铁磁体2H-AgNiO_2的微米大小的单晶进行的热力学和输运测量。我们观察到在13.5的磁相变级联,沿易轴施加的磁场中的20 T,28 T和39 T,我们结合磁转矩,比热和传输数据来构建场温度相图。将低场实验数据与基于实际参数的AgNiO_2局部矩的失意易轴海森堡模型的理论计算进行了比较。该模型预测的偏差归因于流动电子的作用。

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  • 来源
    《Physical review》 |2014年第2期|020401.1-020401.5|共5页
  • 作者单位

    Clarendon Laboratory, Department of Physics, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom,H. H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol BS8 1TL, United Kingdom;

    Department of Physics, Technion -Israel Institute of Technology, Haifa 32000, Israel,Max-Planck-Institut fuer Physik komplexer Systeme, 01187 Dresden, Germany,H. H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol BS8 1TL, United Kingdom;

    High Field Magnet Laboratory, IMM, Radboud University Nijmegen, 6525 ED Nijmegen, The Netherlands;

    H. H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol BS8 1TL, United Kingdom;

    H. H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol BS8 1TL, United Kingdom;

    Max-Planck-Institut fur Festkorperforschung, Heisenbergstrasse 1, 70569 Stuttgart, Germany,RIKEN(The Institute of Physical and Chemical Research), Wako, Saitama 351-0198, Japan,H. H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol BS8 1TL, United Kingdom;

    Laboratoire National des Champs Magnetiques Internes (CNRS), 31077 Toulouse, France;

    High Field Magnet Laboratory, IMM, Radboud University Nijmegen, 6525 ED Nijmegen, The Netherlands;

    National High Magnetic Field Laboratory, Los Alamos National Laboratory, MS E536, Los Alamos, New Mexico 87545, USA;

    Max-Planck-Institut fur Festkorperforschung, Heisenbergstrasse 1, 70569 Stuttgart, Germany;

    Max-Planck-Institut fur Festkorperforschung, Heisenbergstrasse 1, 70569 Stuttgart, Germany;

    Okinawa Institute of Science and Technology, 1919-1 Tancha, Onna-son, Kunigami, Okinawa 904-0495, Japan,Clarendon Laboratory, Department of Physics, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom,H. H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol BS8 1TL, United Kingdom;

    Clarendon Laboratory, Department of Physics, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom,H. H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol BS8 1TL, United Kingdom;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    quantized spin models; other topics in quantum fluids and solids; liquid and solid helium (restricted to new topics in section 67); fermi surface: calculations and measurements; effective mass, G factor; strongly correlated electron systems; heavy fermions;

    机译:量化自旋模型量子流体和固体中的其他主题;液态氦和固态氦(仅限于第67节中的新主题);费米表面:计算和测量;有效质量;G因子;强相关电子系统;重费米子;

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