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Neutron diffraction and μSR studies of two polymorphs of nickel niobate NiNb_2O_6

机译：铌酸镍NiNb_2O_6的两种多晶型物的中子衍射和μSR研究

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摘要

Neutron diffraction and muon spin relaxation (μSR) studies are presented for the newly characterized polymorph of NiNb_2O_6 (β-NiNb_2-O_6) with space group P4_(2) and μSR data only for the previously known columbite structure polymorph with space group Pbcn. The magnetic structure of the P4_(2) form was determined from neutron diffraction using bom powder and single-crystal data. Powder neutron diffraction determined an ordering wave vector k = (1/2.1/2,1/2). Single-crystal data confirmed the same k vector and showed that the correct magnetic structure consists of antiferromagnetically coupled chains running along the a or b axis in adjacent Ni~(2+) layers perpendicular to the c axis, which is consistent with the expected exchange interaction hierarchy in this system. The refined magnetic structure is compared with the known magnetic structures of the closely related trirutile phases, NiSb_2O_6 and NiTa_2_6. μSR data finds a transition temperature of T_N ~ 15 K for this system, while the columbite polymorph exhibits a lower T_N = 5.7(3) K. Our μSR measurements also allowed us to estimate the critical exponent of the order parameter for each polymorph. We found β = 0.25(3) and 0.16(2) for the β and columbite polymorphs, respectively. The single-crystal neutron scattering data give a value for the critical exponent β = 0.28(3) for β-NiNb_2O_6, in agreement with the μSR value. While both systems have ft values less than 0.3, which is indicative of reduced dimensionality, this effect appears to be much stronger for the columbite system. In other words, although both systems appear to be well described by S = 1 spin chains, the interchain interactions in the β polymorph are likely much larger.
机译：提出了对具有空间群P4_（2 / n）的NiNb_2O_6（β-NiNb_2-O_6）新表征的多晶型物进行中子衍射和μ子自旋弛豫（μSR）的研究，仅针对先前已知的具有空间群Pbcn的哥伦比结构多晶型物具有μSR数据。 。 P4（2 / n）形式的磁性结构是使用Bom粉末和单晶数据通过中子衍射确定的。粉末中子衍射确定了有序波矢量k =（1 / 2.1 / 2,1 / 2）。单晶数据证实了相同的k向量，并表明正确的磁性结构由垂直于c轴的相邻Ni〜（2+）层中沿a轴或b轴运行的反铁磁耦合链组成，与预期的交换一致系统中的交互层次结构。将精炼的磁结构与紧密相关的三重相NiSb_2O_6和NiTa_2_6的已知磁结构进行比较。 μSR数据发现该系统的转变温度为T_N〜15 K，而钴矿多晶型物的T_N = 5.7（3）K更低。我们的μSR测量结果还使我们能够估算每个多晶型物的阶跃参数的临界指数。我们发现β和钴矿多晶型分别为β= 0.25（3）和0.16（2）。单晶中子散射数据给出了β-NiNb_2O_6的临界指数β= 0.28（3）的值，与μSR值一致。尽管两个系统的ft值均小于0.3，这表明尺寸减小，但对于哥伦比系统，此效果似乎要强得多。换句话说，尽管两个系统似乎都可以用S = 1的自旋链很好地描述，但是β多晶型物中的链间相互作用可能更大。

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  • 来源
    《Physical review》 |2017年第14期|144417.1-144417.9|共9页
  • 作者

    T. J. S. Munsie; M. N. Wilson; A. Millington; C. M. Thompson; R. Flacau; C. Ding; S. Guo; Z. Gong; A. A. Aczel; H. B. Cao; T. J. Williams; H. A. Dabkowska; F. Ning; J. E.Greedan; G. M. Luke;

  • 作者单位

    Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada 8S 4M1;

    Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada 8S 4M1;

    Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada 8S 4M1;

    Department of Chemistry, Purdue University, West Lafayette, Indiana 47907-2084, USA;

    Canadian Neutron Beam Centre, Chalk River, Ontario, Canada KOJ 1J0;

    Department of Physics, Zhejiang University, Hangzhou 310027, China;

    Department of Physics, Zhejiang University, Hangzhou 310027, China;

    Department of Physics, Columbia University, New York, New York 10027, USA;

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

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

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

    Brockhouse Institute for Materials Research, McMaster University, Hamilton, Ontario, Canada L8S 4M1;

    Department of Physics, Zhejiang University, Hangzhou 310027, China;

    Brockhouse Institute for Materials Research, McMaster University, Hamilton, Ontario, Canada L8S 4M1 ,Department of Chemistry, McMaster University, Hamilton, Ontario, Canada L8S 4M1;

    Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada 8S 4M1 ,Brockhouse Institute for Materials Research, McMaster University, Hamilton, Ontario, Canada L8S 4M1 ,Canadian Institute for Advanced Research, Toronto, Ontario, Canada M5G 1M1;

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