论文标题
la $ _ {2-x} $ sr $ _x $ coo $ _4 $ _4 $ $ _ $ _ $ _ $ _4 $的价值特定自旋状态和本地扭曲的演变
Evolution of valence-specific spin states and local distortions in La$_{2-x}$Sr$_x$CoO$_4$
论文作者
论文摘要
我们提供了X射线光谱证据，证明了单层so架中价特异性自旋状态和四方变形的演变。 CO $ L_3 $ - 谐振X射线散射的测量结果显示$ t_ {2g} $ CO的电子结构用于孔掺杂的LA $ _ $ _ {2-x} $ _X $ _X $ _X $ COO $ _4 $（$ x $ x $ = 0.5、0.7和0.7和0.8）。随着SR兴奋剂$ x $的增加，高旋转co $^{2+} $的$ t_ {2g} $的四方分裂减少，而低旋转co $^{3+} $的四方分裂增加了，而高型Spin Co $^{3+}的分数增加了。结果使我们能够阐明由旋转轨道耦合和四方变形的相互作用引起的混合价钴酸盐中磁各向异性和平面电阻率的变化的起源。
We present X-ray spectroscopic evidence for the evolution of valence-specific spin states and tetragonal distortions in single-layer cobaltates. Measurements of Co $L_3$-edge resonant inelastic X-ray scattering reveal the $t_{2g}$ electronic structure of Co for hole-doped La$_{2-x}$Sr$_x$CoO$_4$ ($x$ = 0.5, 0.7 and 0.8). As the Sr-doping $x$ increases, the tetragonal splitting of the $t_{2g}$ states of high-spin Co$^{2+}$ decreases, whereas that of low-spin Co$^{3+}$ increases and the fraction of high-spin Co$^{3+}$ increases. The results enable us to clarify the origin of the change of magnetic anisotropy and in-plane resistivity in a mixed-valence cobaltate caused by the interplay of spin-orbit coupling and tetragonal distortion.
