Na $_5$ Co $_{15.5}$ Te $_6$ O $_{36}$的短程磁相关、变磁性和一致介电异常
Short range magnetic correlation, metamagnetism and coincident dielectric anomaly in Na$_5$Co$_{15.5}$Te$_6$O$_{36}$
摘要：
在这里，我们探索的结构，磁性和介电性能的Co基化合物Na $_5$ Co $_{15.5}$ Te $_6$ O $_{36}$作为一个候选人的短程磁相关驱动的发展的介电异常高于N $\acute{e}$ el温度（$T_N$ =）50 K。零磁场下的低温中子粉末衍射（NPD）结果表明，反铁磁转变是由倾斜的自旋结构引起的，部分占据的Co与其它Co形成短程磁关联，进一步促进了反铁磁转变以上的结构畸变和介电异常的发展.此外，温度依赖的磁热容量和电子自旋共振测量揭示了短程磁相关的存在，这与介电常数与温度曲线中的异常相一致。此外，晶格参数的显着变化也观察到在相同的温度，表明存在明显的自旋-晶格耦合。此外，在磁场相关的磁化的急剧跳跃清楚地表明存在的变磁过渡和磁场相关的NPD证实，旋转的Co自旋与施加的磁场是负责这种变磁相变。因此，这种转变导致磁热效应在系统中发展，这适合于低温制冷的应用。
英文摘要：
Here we explore the structural, magnetic and dielectric properties of Co based compound Na$_5$Co$_{15.5}$Te$_6$O$_{36}$ as a candidate of short-range magnetic correlations driven development of dielectric anomaly above N$\acute{e}$el temperature of ($T_N$=) 50 K. Low temperature neutron powder diffraction (NPD) in zero applied magnetic field clearly indicates that the canted spin structure is responsible for the antiferromagnetic transition and partially occupied Co form short range magnetic correlation with other Co, which further facilitates the structural distortion and consequent development of dielectric anomaly above antiferromagnetic transition. Additionally, the temperature dependent magnetic heat capacity and electron spin resonance measurements reveal the presence of short-range magnetic correlations which coincides with an anomaly in the dielectric constant vs temperature curve. Moreover, significant changes in the lattice parameters are also observed around the same temperature, indicating presence of noticeable spin-lattice coupling. Further, sharp jump in the magnetic field dependent magnetization clearly indicates the presence of metamagnetic transition and magnetic field dependent NPD confirms that rotations of Co spins with applied magnetic field are responsible for this metamagnetic phase transition. As a result, this transition causes the magnetocaloric effect to be developed in the system, which is suitable for the application in low temperature refrigeration.
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