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首页> 外文期刊>Physical review >Magnetic field and temperature dependence of the amplitude-modulated magnetic structure of PrNi_2Si_2 determined by single-crystal neutron diffraction
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Magnetic field and temperature dependence of the amplitude-modulated magnetic structure of PrNi_2Si_2 determined by single-crystal neutron diffraction

机译：单晶中子衍射确定的PrNi_2Si_2调幅磁性结构的磁场和温度依赖性

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摘要

The temperature and magnetic field dependence of the magnetic structure in the singlet crystal-field ground-state system PrNi-2Si_2 have been determined using single-crystal neutron diffraction. At the magnetic ordering temperature in zero field, T_N=20.0 ±0.5 K, an amplitude-modulated magnetic structure sets in with a propagation vector k=(0,0,0.87) and the magnetic moments of the Pr~(3+) ions parallel to the c axis of the body-centered tetragonal structure. The magnetic structure remains amplitude modulated down to low temperatures (T= 1.6 K) with only a small tendency to squaring up, as signaled by the weak intensity of the third harmonic that develops below 16 K. With applied field along the easy axis, the modulated structure goes smoothly over into a ferromagnetic state. At the critical field of H_C=58 kOe, the first harmonic disappears and the field-induced ferromagnetic moment shows a kink, in agreement with magnetization measurements. Both the temperature and magnetic field dependence are well described by a periodic field Hamiltonian including magnetic exchange and the crystalline electric field.
机译：使用单晶中子衍射法已经确定了单线态晶体场基态系统PrNi-2Si_2中磁性结构的温度和磁场依赖性。在零场的磁有序温度T_N = 20.0±0.5 K时，振幅调制的磁结构以传播矢量k =（0,0,0.87）和Pr〜（3+）离子的磁矩进入平行于以人体为中心的四边形结构的c轴。磁结构在低至低温（T = 1.6 K）的情况下仍保持振幅调制，只有很小的方波趋势，这是由于在16 K以下发展而来的三次谐波的强度很弱所致。调制结构平稳地进入铁磁状态。在H_C = 58 kOe的临界场处，与磁化测量结果一致，一次谐波消失并且场感应的铁磁矩显示出扭结。温度和磁场的依赖性都可以通过包含磁场交换和晶体电场的周期性哈密顿量很好地描述。

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  • 来源
    《Physical review》 |2010年第5期|P.054414.1-054414.6|共6页
  • 作者

    J. A. Blanco; B. Fak; rnE. Ressouche; rnB. Grenier; M. Rotter; rnD. Schmitt; rnJ. A. Rodriguez-Velamazan; rnJ. Campo; rnP. Lejay;

  • 作者单位

    Departamento de Fisica, Universidad de Oviedo, E-33007 Oviedo, Spain;

    Commissariat a I'Energie Atomique, INAC, SPSMS, 38054 Grenoble, France;

    rnCommissariat a I'Energie Atomique, INAC, SPSMS, 38054 Grenoble, France;

    rnCommissariat a I'Energie Atomique, INAC, SPSMS, 38054 Grenoble, France Universite Joseph Fourier, Grenoble-I, France;

    rnDepartment of Physics, Clarendon Laboratory, University of Oxford, Parks Road, Oxford OXI 3PU, United Kingdom;

    Laboratoire de Geophysique Interne et Tectonophysique (LGIT), CNRS-UJF, BP 53, 38041 Grenoble Cedex 9, France;

    rnInstitut Laue Langevin, 6 rue Jules Horowitz, BP 156, 38042 Grenoble Cedex 9, France Instituto de Ciencia de Materiales de Aragom, CSIC-Universidad de Zaragoza, 50009 Zaragoza, Spain;

    rnInstituto de Ciencia de Materiales de Aragom, CSIC-Universidad de Zaragoza, 50009 Zaragoza, Spain;

    rnHnstitut Neel, CNRS, BP 166, 38042 Grenoble Cedex 9, France;

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

    crystal-field theory and spin hamiltonians; antiferromagnetics;

    机译：晶体场理论和自旋哈密顿论;反铁磁;

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