论文标题
准二维灯笼的磁性特性，氧硼酸钙CA $ _4 $ lno（bo $ _3 $）$ _ 3 $
Magnetic properties of quasi-one-dimensional lanthanide calcium oxyborates Ca$_4$LnO(BO$_3$)$_3$
论文作者
论文摘要
这项研究检查了灯笼钙氧硼酸钙CA $ _4 $ lno（bo $ _3 $）$ _ 3 $（ln = la，pr，nd，nd，sm，sm，eu，gd，tb，tb，dy，ho，ho，y，y，y，yb）。使用粉末X射线衍射证实了报告的单斜结构（空间群$ cm $）。磁性Ln $^{3+} $离子位于与C轴平行分离的链中，在准二维阵列中。 Here we report the first bulk magnetic characterisation of Ca$_4$LnO(BO$_3$)$_3$ using magnetic susceptibility $χ$(T) and isothermal magnetisation M(H) measurements at T $\geq$ 2 K. With the sole exception of Ca$_4$TbO(BO$_3$)$_3$, which displays a transition at T = 3.6 K, no magnetic过渡发生在2 K以上，而Curie-Weiss的分析表明所有样品的抗磁磁性最接近的邻次相互作用。磁熵变化的计算$δs_m$表示CA $ _4 $ GDO（BO $ _3 $）$ _ 3 $和CA $ _4 $ HOO（BO $ _3 $）$ _ 3 $是可行的磁环平衡材料，分别是液态氦气温度和低场机制的液体温度。
This study examines the lanthanide calcium oxyborates Ca$_4$LnO(BO$_3$)$_3$ (Ln = La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Y, Er, Yb). The reported monoclinic structure (space group $Cm$) was confirmed using powder X-ray diffraction. The magnetic Ln$^{3+}$ ions are situated in well-separated chains parallel to the c axis in a quasi-one-dimensional array. Here we report the first bulk magnetic characterisation of Ca$_4$LnO(BO$_3$)$_3$ using magnetic susceptibility $χ$(T) and isothermal magnetisation M(H) measurements at T $\geq$ 2 K. With the sole exception of Ca$_4$TbO(BO$_3$)$_3$, which displays a transition at T = 3.6 K, no magnetic transitions occur above 2 K, and Curie-Weiss analysis indicates antiferromagnetic nearest-neighbour interactions for all samples. Calculation of the magnetic entropy change $ΔS_m$ indicates that Ca$_4$GdO(BO$_3$)$_3$ and Ca$_4$HoO(BO$_3$)$_3$ are viable magnetocaloric materials at liquid helium temperatures in the high-field and low-field regimes respectively.
