论文标题
Wolframite Mgreo的磁性$ _4 $
Magnetic nature of wolframite MgReO$_4$
论文作者
论文摘要
属于家族的rhenium氧化物$ a $ reo $ _4 $，其中$ a $是金属阳离子，具有有趣的电子和磁性特性。在这项研究中，我们利用了MUON自旋旋转/放松（$μ^+$ SR）技术来研究MGREO $ _4 $化合物的磁性。据我们所知，这是关于这种有趣材料的首次研究，该研究使用特殊的高压合成技术在Wolframite晶体结构中稳定。大量磁研究表明，抗铁磁性（AF）远距离顺序或以$ t _ {\ rm c1} \ oft 90 $ 〜k处为单重旋转状态的发作，并在$ t _ {\ rm c2}} \ ac2} \ acc280 $ 〜k处具有微妙的第二高温度过渡。这两个过渡也通过热容量（$ C_P $）测量确认。从我们的$μ^+$ sr测量值中，很明显，样本在$ t _ {\ rm c1} = t _ {\ rm n} \ oft85 $ 〜k中输入AF订单。我们在$ t _ {\ rm n} $上方没有磁信号的证据，这表明$ t _ {\ rm c2} $可能与结构过渡有关。此外，通过敏感的零字段（ZF）$μ^+$ sr测量结果，我们找到了$ t _ {\ rm cant} \ oft 65 $ 〜k的旋转重新定位的证据。这指向在低温下从共线AF到倾斜的AF顺序的过渡，该过渡是由竞争磁相互作用驱动的。
Rhenium oxides belonging to the family $A$ReO$_4$ where $A$ is a metal cation, exhibit interesting electronic and magnetic properties. In this study we have utilized the muon spin rotation/relaxation ($μ^+$SR) technique to study the magnetic properties of the MgReO$_4$ compound. To the best of our knowledge, this is the first investigation reported on this interesting material, that is stabilized in a wolframite crystal structure using a special high-pressure synthesis technique. Bulk magnetic studies show the onset of an antiferromagnetic (AF) long range order, or a possible singlet spin state at $T_{\rm C1}\approx90$~K, with a subtle second high-temperature transition at $T_{\rm C2}\approx280$~K. Both transitions are also confirmed by heat capacity ($C_p$) measurements. From our $μ^+$SR measurements, it is clear that the sample enters an AF order below $T_{\rm C1}=T_{\rm N}\approx85$~K. We find no evidence of magnetic signal above $T_{\rm N}$, which indicates that $T_{\rm C2}$ is likely linked to a structural transition. Further, via sensitive zero field (ZF) $μ^+$SR measurements we find evidence of a spin reorientation at $T_{\rm Cant}\approx65$~K. This points towards a transition from a collinear AF into a canted AF order at low temperature, which is proposed to be driven by competing magnetic interactions.
