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首页> 外文期刊>Physical review >~(63/65)Cu-and ~(35/37)CI-NMR studies of triplet localization in the quantum spin system NH_4CuCl_3
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~(63/65)Cu-and ~(35/37)CI-NMR studies of triplet localization in the quantum spin system NH_4CuCl_3

机译：量子自旋系统NH_4CuCl_3中三重态的〜（63/65）Cu-和〜（35/37）CI-NMR研究

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摘要

~(63/65)Cu- and ~(35/37)Cl-NMR experiments were performed to investigate triplet localization in the S= 1/2 dimer compound NH_4CuCl_3, which shows magnetization plateaus at one-quarter and three-quarters of the saturation magnetization. In ~(63/65)Cu-NMR experiments, signal from only the singlet Cu site was observed, because that from the triplet Cu site was invisible due to the strong spin fluctuation of onsite 3d spins. We found that the temperature dependence of the shift of ~(63/65)Cu-NMR spectra at the singlet Cu site deviated from that of macroscopic magnetization below T=6 K. This deviation is interpreted as the triplet localization in this system. From the ~(35/37)Cl-NMR experiments at the 1/4-plateau phase, we found the two different temperature dependences of Cl shift, namely, the temperature dependence of one deviates below T=6 K from that of the macroscopic magnetization as observed in the ~(63/65)Cu-NMR experiments, whereas the other corresponds well with that of the macroscopic magnetization in the entire experimental temperature region. We interpreted these dependences as reflecting the transferred hyperfine field at the Cl site located at a singlet site and at a triplet site, respectively. This result also indicates that the triplets are localized at low temperatures. ~(63/65)Cu-NMR experiments performed at high magnetic fields between the one-quarter and three-quarters magnetization plateaus have revealed that the two differently oriented dimers in the unit cell are equally occupied by triplets, the fact of which limits the theoretical model on the periodic structure of the localized triplets.
机译：进行〜（63/65）Cu-和〜（35/37）Cl-NMR实验以研究在S = 1/2二聚体化合物NH_4CuCl_3中的三重态定位，该图显示了在四分之一和四分之三的磁化平台。饱和磁化强度。在〜（63/65）Cu-NMR实验中，仅观察到来自单峰Cu位点的信号，因为来自三重峰Cu位点的信号由于现场3d自旋的强烈自旋波动而看不见。我们发现，在单线态Cu位处〜（63/65）Cu-NMR光谱的位移与温度的相关性与T = 6 K以下的宏观磁化强度的偏离有关。该偏差被解释为该系统中的三线态局部化。从1/4平台相的〜（35/37）Cl-NMR实验中，我们发现了Cl位移的两种不同的温度依赖性，即，一个温度依赖性从宏观角度偏离了T = 6 K以下。在〜（63/65）Cu-NMR实验中观察到的磁化强度，而另一个磁化强度在整个实验温度范围内都与宏观磁化强度很好对应。我们将这些依赖性解释为分别反映了位于单重态和三重态的Cl处的转移超精细场。该结果还表明三联体位于低温下。在四分之一和四分之三的磁化高原之间的高磁场下进行的〜（63/65）Cu-NMR实验表明，晶胞中两个不同取向的二聚体被三重态均等占据，这一事实限制了局部三胞胎周期结构的理论模型。

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  • 来源
    《Physical review》 |2009年第17期|174418.1-174418.7|共7页
  • 作者

    H. Inoue; S. Tani; S. Hosoya; K. Inokuchi; T. Fujiwara; T. Saito; T. Suzuki; A. Oosawa; T. Goto; M. Fujisawa; H. Tanaka; T. Sasaki; S. Awaji; K. Watanabe; N. Kobayashi;

  • 作者单位

    Department of Physics, Sophia University, Kioi-cho, Chiyoda-ku, Tokyo 102-8554, Japan;

    Department of Physics, Sophia University, Kioi-cho, Chiyoda-ku, Tokyo 102-8554, Japan;

    Department of Physics, Sophia University, Kioi-cho, Chiyoda-ku, Tokyo 102-8554, Japan;

    Department of Physics, Sophia University, Kioi-cho, Chiyoda-ku, Tokyo 102-8554, Japan;

    Department of Physics, Sophia University, Kioi-cho, Chiyoda-ku, Tokyo 102-8554, Japan;

    Department of Physics, Sophia University, Kioi-cho, Chiyoda-ku, Tokyo 102-8554, Japan;

    Advanced Meson Science Laboratory, RIKEN Nishina Center, Hirosawa, Wako-shi, Saitama 351-0198, Japan Department of Physics, Sophia University, Kioi-cho, Chiyoda-ku, Tokyo 102-8554, Japan;

    Department of Physics, Sophia University, Kioi-cho, Chiyoda-ku, Tokyo 102-8554, Japan;

    Department of Physics, Sophia University, Kioi-cho, Chiyoda-ku, Tokyo 102-8554, Japan;

    Department of Physics, Tokyo Institute of Technology, Oh-okayama, Meguro-ku, Tokyo 152-8551, Japan;

    Department of Physics, Tokyo Institute of Technology, Oh-okayama, Meguro-ku, Tokyo 152-8551, Japan;

    Institute for Materials Research, Tohoku University, Katahira, Aoba-ku, Sendai 980-8577, Japan;

    Institute for Materials Research, Tohoku University, Katahira, Aoba-ku, Sendai 980-8577, Japan;

    Institute for Materials Research, Tohoku University, Katahira, Aoba-ku, Sendai 980-8577, Japan;

    Institute for Materials Research, Tohoku University, Katahira, Aoba-ku, Sendai 980-8577, Japan;

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  • 关键词

    magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.); effects of internal magnetic fields;

    机译：磁相边界（包括磁跃迁;超磁性等）;内部磁场的影响;

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