Anomalous Ferromagnetic Behavior in Orthorhombic Li3Co2SbO6
Anomalous Ferromagnetic Behavior in Orthorhombic Li3Co2SbO6
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正交晶系 Li3Co2SbO6 的反常铁磁行为
DOI：
10.1021/acs.inorgchem.2c01293
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发表时间：
2022
影响因子：
4.6
通讯作者：
Guo Hanjie
中科院分区：
文献类型：
--
作者：
Duan Qianhui;Bu Huanpeng;Pomjakushin Vladimir;Luetkens Hubertus;Li Yuke;Zhao Jinkui;Gardner Jason S.;Guo Hanjie
单斜相Li $_3$Co $_2$SbO $_6 $已被提出作为Kitaev自旋液体的候选者并被深入研究，而其多晶型物，正交相的性质却鲜为人知。在这里，我们报告的正交晶系Li $3$Co $2$SbO $6 $的磁性能所揭示的直流和交流磁化率，μ子自旋弛豫（$mu$SR）和中子衍射测量。在低场直流磁化率测量中观察到（115，89和71）K的连续磁转变。低于$T_N$（= 115 K）的跃迁在较高的外加磁场下被抑制。然而，零场交流磁化率测量揭示了在约（114，107，97，79和71）K的明显的频率无关的转变。一个长程磁有序态被比热，$mu$SR和中子衍射测量所证实，所有这些都表明在约115 K处的单一跃迁。不同测量之间的差异归因于可能的堆垛层错和/或铁磁之字形链的局部紊乱，导致在整个反铁磁矩阵内的铁磁边界。
Monoclinic Li$_3$Co$_2$SbO$_6$ has been proposed as a Kitaev spin liquid candidate and investigated intensively, whereas the properties of its polymorph, the orthorhombic phase, is less known. Here we report the magnetic properties of the orthorhombic Li$_3$Co$_2$SbO$_6$ as revealed by dc and ac magnetic susceptibility, muon spin relaxation ($mu$SR) and neutron diffraction measurements. Successive magnetic transitions at (115, 89 and 71) K were observed in the low field dc susceptibility measurements. The transitions below $T_N$ (= 115 K), are suppressed in higher applied fields. However, zero field, ac susceptibility measurements reveals distinct frequency independent transitions at about (114, 107, 97, 79 and 71) K. A long range magnetic ordered state was confirmed by specific heat, $mu$SR and neutron diffraction measurements, all indicating a single transition at about 115 K. The discrepancy between different measurements is attributed to possible stacking faults and/or local disorders of the ferromagnetic zig-zag chains, resulting in ferromagnetic boundaries within the overall antiferromagnetic matrix.