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首页> 外文期刊>Physical review >Possible quadrupolar nematic phase in the frustrated spin chain LiCuSbO_4: An NMR investigation
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Possible quadrupolar nematic phase in the frustrated spin chain LiCuSbO_4: An NMR investigation

机译：沮丧的自旋链LiCuSbO_4中可能的四极向列相：NMR研究

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摘要

The frustrated one-dimensional quantum magnet LiCuSbO_4 is a rare realization of the J_1-J_2 spin chain model with an easily accessible saturation field, formerly estimated at 12 T. Exotic multipolar nematic phases were theoretically predicted in such compounds just below the saturation field, but without unambiguous experimental observation so far. In this paper we present extensive experimental research on the compound in a wide temperature (30 mK to 300 K) and field (0-13.3 T) range by muon spin rotation (µSR),~7Li nuclear magnetic resonance (NMR), and magnetic susceptibility (SQUID). µSR experiments in zero magnetic field demonstrate the absence of long-range 3D ordering down to 30 mK. Together with former heat capacity data [Dutton et al., Phys. Rev. Lett. 108, 187206 (2012)], magnetic susceptibility measurements suggest a short-range-correlated vector chiral phase in the field range 0-4 T. At the intermediate-field values (5-12 T), the system enters a 3D-ordered spin density wave phase with 0.75 µB per copper site at lowest temperatures (125 mK), estimated by NMR. At still higher field, the magnetization is found to be saturated above 13 T where the spin lattice T_1~(-1) relaxation reveals a spin gap estimated at 3.2(2) K. We narrow down the possibility of observing a multipolar nematic phase to the range 12.5-13 T.
机译：沮丧的一维量子磁体LiCuSbO_4是J_1-J_2自旋链模型的稀有实现，该模型具有易于访问的饱和场，先前估计为12T。到目前为止，没有明确的实验观察。在本文中，我们通过介子自旋旋转（µSR），〜7Li核磁共振（NMR）和磁学研究了该化合物在宽温度（30 mK至300 K）和场（0-13.3 T）范围内的广泛实验研究。磁化率（SQUID）。在零磁场下的µSR实验表明，没有低至30 mK的长距离3D排序。连同以前的热容量数据[Dutton等，Phys。牧师108，187206（2012）]，磁化率测量表明在0-4 T的磁场范围内存在短程相关的矢量手性相。在中间磁场值（5-12 T）下，系统进入3D排序自旋密度波相，在最低温度（125 mK）下，每个铜位为0.75 µB，通过NMR估算。在更高的磁场下，发现磁化强度在13 T以上饱和，自旋晶格T_1〜（-1）的弛豫揭示出自旋间隙估计为3.2（2）K。我们将观察到多极向列相的可能性缩小到范围12.5-13T。

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  • 来源
    《Physical review》 |2017年第22期|224424.1-224424.11|共11页
  • 作者

    M. Bosiocic; F. Bert; S. E. Dutton; R. J. Cava; P. J. Baker; M. Pozek; P. Mendels;

  • 作者单位

    Department of Physics, Faculty of Science, University of Zagreb, Bijenilka 32, HR-10000 Zagreb, Croatia;

    Laboratoire de Physique des Solides, CNRS, Universiti Paris-Sud, Universiti Paris-Saclay, 91405 Orsay Cedex, France;

    Cavendish Laboratory, University of Cambridge, JJ Thomson Avenue, Cambridge CB3 OHE, United Kingdom;

    Department of Chemistry, Princeton University, Princeton, New Jersey 08544, USA;

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

    Department of Physics, Faculty of Science, University of Zagreb, Bijenilka 32, HR-10000 Zagreb, Croatia;

    Laboratoire de Physique des Solides, CNRS, Universiti Paris-Sud, Universiti Paris-Saclay, 91405 Orsay Cedex, France;

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