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Magnetic correlations in Ho_x Tb_(2-x)Ti_2O_7

机译:Ho_x Tb_(2-x)Ti_2O_7中的磁相关

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摘要

Polycrystalline samples of Ho_xTb_(2-x)Ti_2O_7 (0 < x < 2) have been prepared and characterized for their structural and magnetic properties. The parent compounds of this solid solution are the spin ice Ho_2Ti_2O_7 and the spin liquid Tb_2Ti_2O_7. Specific-heat measurements on HoTbTi_2O_7 (x = 1.0) reveal the absence of a long-range order state above 0.5 K. The integrated entropies of all Ho_xTb_(2-x)Ti_2O_7 specimens up to 30 K scale well with the ratio of spin ice and spin liquid in the composition. The neutron diffraction spectrum of HoTbTi_2O_7 exhibits a dipolar spin-ice pattern and can be well described by mean-field theory for (111) Ising spins, nearest-neighbor exchange, and dipolar interactions. Inelastic neutron scattering on HoTbTi_2O_7 reveals two dispersionless excitations, one of ~2.5 meV out of the ground state, and a 4-meV transition out of an excited state. We argue that these data suggest that the very strong single-ion effects of Ho_2Ti_2O_7 and Tb_2Ti_2O_7 persist in the Ho_xTb_(2-x)Ti_2O_7(0 < x < 2) solid solution, whereas the Tb-Ho correlations are weak, resulting in small shifts in the energy scales but with no dramatic effect on the bulk properties.
机译:已经制备了Ho_xTb_(2-x)Ti_2O_7(0

著录项

  • 来源
    《Physical review》 |2011年第14期|p.144413.1-144413.7|共7页
  • 作者单位

    Department of Physics, National Cheng Kung University, Tainan 70101, Taiwan,Quantum Beam Science Directorate, Japan Atomic Energy Agency (JAEA), Tokai, Ibaraki 319-1195, Japan;

    Institutfur Festkoerperforschung, Forschungszentrum Jtilich, DE-52425 Jiilich, Germany;

    Department of Physics, National Taiwan University, Taipei 106, Taiwan,Center of Quantum Science and Engineering, National Taiwan University, Taipei 10607, Taiwan;

    Department of Physics, National Taiwan University, Taipei 106, Taiwan,Department of Physics and Astronomy, Rice University, Houston, Texas 77005, USA;

    Institutfur Festkoerperforschung, Forschungszentrum Jtilich, DE-52425 Jiilich, Germany;

    Institutfur Festkoerperforschung, Forschungszentrum Jtilich, DE-52425 Jiilich, Germany;

    Department of Physics, National Taiwan University, Taipei 106, Taiwan;

    Institute of Physics, Academia Sinica, Nankang Taipei 115, Taiwan;

    Indiana University, 2401 Milo B. Sampson Lane, Bloomington, Indiana 47408, USA;

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

    neutron scattering; studies of specific magnetic materials;

    机译:中子散射;特殊磁性材料研究;

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