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首页> 外文期刊>Physical review >Exploring the complex magnetic phase diagram of Ce_2PdGe_3: A neutron powder diffraction and μSR study
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Exploring the complex magnetic phase diagram of Ce_2PdGe_3: A neutron powder diffraction and μSR study

机译：探索Ce_2PdGe_3的复相图：中子粉末衍射和μSR研究

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摘要

The magnetic state of the tetragonal compound Ce_2PdGe_3, which crystallizes in the space group P4_2 / mmc, a derivative of the α-ThSi_2 structure, has been investigated by magnetic susceptibility, heat capacity, muon spin relaxation (μSR), and neutron diffraction measurements. Heat capacity data indicate two separate magnetic phase transitions at T_(N1) = 10.7 K and T_(N2) = 2.3 K. The presence of bulk long-range magnetic order is confirmed by our μSR study below 11 K, where a drop of nearly 2/3 in the muon initial asymmetry and a sharp increase in the muon depolarization rate were observed. Neutron powder diffraction reveals that only one out of two Ce sites becomes magnetically ordered with magnetic propagation vector κ = (0) at T_(N1), adopting an antiferromagnetic arrangement of magnetic moments μ_(Ce~(3+)) = 1.78(1)μ_B along the c axis. At T_(N2) the second Ce site orders similarly, following the same magnetic propagation vector κ = (0), showing, however, at the same time a significant ferromagnetic component within the tetragonal basal plane. A second propagation vector, κ = (1/2, 0, 1/2), appears concomitantly at T_(N2).
机译：通过磁化率，热容量，μ子自旋弛豫（μSR）和中子衍射测量研究了在空间群P4_2 / mmc（α-ThSi_2结构的衍生物）中结晶的四方化合物Ce_2PdGe_3的磁态。热容数据表明在T_（N1）= 10.7 K和T_（N2）= 2.3 K时两个独立的磁相变。通过11 K以下的μSR研究证实了大范围长程磁阶的存在。观察到μ/μ介子初始不对称性为2/3，μ介子的去极化速率急剧增加。中子粉末衍射显示，在T_（N1）处，两个Ce位置中只有一个在磁传播矢量κ=（0）时成为磁有序的，采用磁矩μ_（Ce〜（3+））= 1.78（1）的反铁磁排列）μ_B沿c轴。在T_（N2）处，第二Ce位置相似，遵循相同的磁传播矢量κ=（0），但是同时显示了四边形基面内的重要铁磁分量。第二传播矢量κ=（1/2，0，1/2），同时出现在T_（N2）处。

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  • 来源
    《Physical review》 |2016年第1期|014418.1-014418.7|共7页
  • 作者

    A. Bhattacharyya; C. Ritter; D. T. Adroja; F. C. Coomer; A. M. Strydom;

  • 作者单位

    ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot Oxon OX11 0QX, United Kingdom,Highly Correlated Matter Research Group, Physics Department, University of Johannesburg, P.O. Box 524, Auckland Park 2006, South Africa;

    Institut Laue Langevin, 6 rue Jules Horowitz, 38042 Grenoble, France;

    ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot Oxon OX11 0QX, United Kingdom,Highly Correlated Matter Research Group, Physics Department, University of Johannesburg, P.O. Box 524, Auckland Park 2006, South Africa;

    ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot Oxon OX11 0QX, United Kingdom;

    Highly Correlated Matter Research Group, Physics Department, University of Johannesburg, P.O. Box 524, Auckland Park 2006, South Africa,Max Planck Institute CPfS, Noethnitzerstrasse 40, 01187 Dresden, Germany;

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