论文标题
Ba $ _2 $ rho $ _4 $的高压合成，分层钙钛矿Sr-ruthenate的Rhodate类似物
High-pressure synthesis of Ba$_2$RhO$_4$, a rhodate analogue of the layered perovskite Sr-ruthenate
论文作者
论文摘要
一种新的分层钙钛矿型氧化物ba $ _2 $ rho $ _4 $由高压技术在凸轮计算的支持下通过高压技术合成。通过实验和计算工具研究了晶体和电子结构。粉末X射线衍射数据的结构改进显示，Ba $ _2 $ rho $ _4 $ $ _4 $在k $ _2 $ _2 $ _4 $ _4 $ type结构，等值到SR $ $ _2 $ _2 $ ruo $ $ _4 $和ba $ _2 $ _2 $ _2 $ iro $ _4 $。 Ba $ _2 $ rho $ _4 $的多晶样品的磁性，电阻率和比热测量值表示该系统可以将其特征在于相关金属。尽管与其SR $ _2 $ ruo $ _4 $相似，在电子特定的热系数和Wilson比率方面，Ba $ _2 $ _2 $ rho $ _4 $均未显示出超导性的签名，降低到0.16 k。 e $ _g $ - （$ d_ {x^^2-y^2} $）频段降至费米级以下，使该化合物的制造也是独特的，也是旋转轨道耦合的mott motted mott ba $ _2 $ _2 $ _2 $ iro $ _4 $的金属对应物。
A new layered perovskite-type oxide Ba$_2$RhO$_4$ was synthesized by a high-pressure technique with the support of convex-hull calculations. The crystal and electronic structure were studied by both experimental and computational tools. Structural refinements for powder x-ray diffraction data showed that Ba$_2$RhO$_4$ crystallizes in a K$_2$NiF$_4$-type structure, isostructural to Sr$_2$RuO$_4$ and Ba$_2$IrO$_4$. Magnetic, resistivity, and specific heat measurements for polycrystalline samples of Ba$_2$RhO$_4$ indicate that the system can be characterized as a correlated metal. Despite the close similarity to its Sr$_2$RuO$_4$ counterpart in the electronic specific heat coefficient and the Wilson ratio, Ba$_2$RhO$_4$ shows no signature of superconductivity down to 0.16 K. Whereas the Fermi surface topology has reminiscent pieces of Sr$_2$RuO$_4$, an electron-like e$_g$-($d_{x^2-y^2}$) band descends below the Fermi level, making of this compound unique also as a metallic counterpart of the spin-orbit-coupled Mott insulator Ba$_2$IrO$_4$.
