...
首页> 外文期刊>Physical review >Structural and magnetic phase transitions in CeCu_(6-x)T_x (T = Ag, Pd)
【24h】

Structural and magnetic phase transitions in CeCu_(6-x)T_x (T = Ag, Pd)

机译:CeCu_(6-x)T_x中的结构和磁性相变(T = Ag,Pd)

获取原文
获取原文并翻译 | 示例
           

摘要

The structural and the magnetic properties of CeCu_(6-x)Ag_x (0 ≤ x ≤ 0.85) and CeCu_(6-x)Pd_x (0 ≤ x ≤ 0.4) have been studied using neutron diffraction, resonant ultrasound spectroscopy (RUS), x-ray diffraction measurements, and first principles calculations. The structural and magnetic phase diagrams of CeCu_(1-x) Ag_x and CeCu_(6-x)Pd_x as a function of Ag/Pd composition are reported. The end member, CeCu_6, undergoes a structural phase transition from an orthorhombic (Pnma) to a monoclinic (P2_(l/c)) phase at 240 K. In CeCu_(6-x)Ag_x, the structural phase transition temperature (T_s) decreases linearly with Ag concentration and extrapolates to zero at x_S ≈ 0.1. The structural transition in CeCu_(6-x)Pd_x remains unperturbed with Pd substitution within the range of our study. The lattice constant b slightly decreases with Ag/Pd doping, whereas a and c increase with an overall increase in the unit cell volume. Both systems, CeCu_(6-x)Ag_x and CeCu_(6-x)Pd_x, exhibit a magnetic quantum critical point (QCP), at x ≈ 0.2 and x ≈ 0.05, respectively. Near the QCP, long range antiferromagnetic ordering takes place at an incommensurate wave vector (δ_1 0 δ_2), where δ_1 ~ 0.62, δ_2 ~ 0.25, x = 0.125 for CeCu_(6-x)Pd_x and δ_1 ~ 0.64, δ_2 ~ 0.3, x = 0.3 for CeCu_(6-x)Ag_x. The magnetic structure consists of an amplitude modulation of the Ce moments which are aligned along the c axis of the orthorhombic unit cell.
机译:使用中子衍射,共振超声光谱(RUS)研究了CeCu_(6-x)Ag_x(0≤x≤0.85)和CeCu_(6-x)Pd_x(0≤x≤0.4)的结构和磁性X射线衍射测量和第一原理计算。报道了CeCu_(1-x)Ag_x和CeCu_(6-x)Pd_x的结构和磁相图随Ag / Pd组成的变化。最终成员CeCu_6在240 K下经历了从正交晶(Pnma)到单斜晶(P2_(l / c))相的结构相变。在CeCu_(6-x)Ag_x中,结构相变温度(T_s)随Ag浓度线性降低,并在x_S≈0.1时外推至零。 CeCu_(6-x)Pd_x的结构转变在我们的研究范围内不受Pd取代的干扰。晶格常数b随Ag / Pd掺杂而略微降低,而a和c随晶胞体积整体增加而增加。 CeCu_(6-x)Ag_x和CeCu_(6-x)Pd_x这两个系统均显示出一个磁性量子临界点(QCP),分别位于x≈0.2和x≈0.05。在QCP附近,远距离反铁磁有序发生在不相称的波矢(δ_10δ_2)处,其中CeCu_(6-x)Pd_x的δ_1〜0.62,δ_2〜0.25,x = 0.125,δ_1〜0.64,δ_2〜0.3,对于CeCu_(6-x)Ag_x,x = 0.3。磁性结构由Ce矩的振幅调制组成,这些Ce矩沿正交晶胞的c轴对齐。

著录项

  • 来源
    《Physical review》 |2015年第21期|214421.1-214421.12|共12页
  • 作者单位

    Department of Physics & Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA,Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA;

    Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA;

    Chemical & Engineering Materials Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA;

    Materials Science & Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA;

    Department of Materials Science & Engineering, University of Tennessee, Knoxville, Tennessee 37996, USA;

    Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA;

    Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA;

    Materials Science & Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA;

    Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA;

    Materials Science & Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA;

    Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA;

    Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA;

    Materials Science & Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA,Department of Physics, Pusan National University, Busan 609-735, Korea;

    Materials Science & Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA;

    Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA;

    Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA;

    Department of Physics & Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA;

    Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA;

    Department of Materials Science & Engineering, University of Tennessee, Knoxville, Tennessee 37996, USA;

    Department of Physics & Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA,Materials Science & Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA,Department of Materials Science & Engineering, University of Tennessee, Knoxville, Tennessee 37996, USA;

    Department of Physics & Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA,Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA;

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

    valence fluctuation, kondo lattice, and heavy-fermion phenomena; effects of material synthesis, crystal structure, and chemicalrncomposition;

    机译:价态波动;近藤晶格和重费米子现象;材料合成;晶体结构和化学成分的影响;

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号