论文标题
单晶的各向异性磁性$ r $ v $ _6 $ sn $ _6 $（$ r $ = y，gd -tm，lu）
Anisotropic magnetic property of single crystals $R$V$_6$Sn$_6$ ($R$ = Y, Gd - Tm, Lu)
论文作者
论文摘要
$ r $ v $ {_ 6} $ sn $ {_ 6} $（$ r $ = y，gd -tm，lu）单晶是通过sn -flux方法合成的，其物理属性的特征是通过磁化，电阻率和特定的热量测量值来表征。所有样品的粉末X射线衍射图案都可以用六角形HFFE $ _6 $ ge $ _6 $ type结构很好地索引，其中稀有原子形成六边形层和钒原子形成kagome层。在高温下，具有稀土（$ r $ = gd-tm）的磁敏感性测量值遵循Curie-Weiss行为。从磁化性曲线的多晶平均值中估计的有效力矩与自由$ r^{3+} $ ion的值一致。除GDV $ _6 $ sn $ _6 $外，观察到矩具有稀有地球的矩形电场效应引起的强磁各向异性。易于磁化方向确定为$ c $轴，$ r $ = tb-ho和$ r $ = er的$ ab $ - 平面和tm。 $ r $ v $ {_ 6} $ sn $ {_ 6} $中的钒离子没有磁矩。 $ r $ = y和lu的化合物具有顺磁金属的典型特征。在低温下，通过磁化，比热和电阻率确认了磁性排序：最高$ t_ {n} = 4.9 $ 〜k，GDV $ _6 $ _6 $ sn $ _6 $和最低$ t_ {n} = 2.3 $ 〜k for Hov $ _6 $ _6 $ sn $ _6 $ _6 $。对于$ r $ = ER和TM，未观察到磁性排序降至1.8〜K。磁性排序温度与DE GENNES缩放的略有偏差表明，在金属$ r $ r $ v $ {_ 6} $ sn $ sn $ {_ 6 6} $ compounds中，主要的ruderman-kittel-kitlel-kasuya-yosida（rkky）交换相互作用。
$R$V${_6}$Sn${_6}$ ($R$ = Y, Gd - Tm, Lu) single crystals are synthesized by Sn-flux method and their physical properties are characterized by magnetization, resistivity, and specific heat measurements. Powder X-ray diffraction patterns of all samples can be well indexed with the hexagonal HfFe$_6$Ge$_6$-type structure, where rare-earth atoms form hexagonal layers and vanadium atoms form Kagome layers. At high temperatures, magnetic susceptibility measurements of moment bearing rare-earths ($R$ = Gd - Tm) follow Curie-Weiss behavior. Effective moments estimated from the polycrystalline average of magnetic susceptibility curves are consistent with the values for free $R^{3+}$ ion. Strong magnetic anisotropy due to crystalline electric field effects is observed for moment bearing rare-earths, except GdV$_6$Sn$_6$. The easy magnetization direction is determined to be $c$-axis for $R$ = Tb - Ho and $ab$-plane for $R$ = Er, and Tm. The vanadium ions in $R$V${_6}$Sn${_6}$ possess no magnetic moment. The compounds for $R$ = Y and Lu exhibit typical characteristics of paramagnetic metals. At low temperatures, the magnetic ordering is confirmed from magnetization, specific heat, and resistivity: the highest $T_{N} = 4.9$~K for GdV$_6$Sn$_6$ and the lowest $T_{N} = 2.3$~K for HoV$_6$Sn$_6$. No magnetic ordering is observed down to 1.8~K for $R$ = Er and Tm. A slight deviation of the magnetic ordering temperature from the de Gennes scaling suggests the dominant Ruderman-Kittel-Kasuya-Yosida (RKKY) exchange interaction between rare-earth moments in metallic $R$V${_6}$Sn${_6}$ compounds.
