轻电子掺杂Sr $_2$ IrO $_4$中磁激发的各向异性软化
Anisotropic softening of magnetic excitations in lightly electron doped Sr$_2$IrO$_4$
摘要：
用共振非弹性X射线散射方法测量了电子掺杂（Sr $_{1-x}$ La $_x$）$_2$ IrO $_4$和$L_3$的磁激发.虽然大大拓宽，定义明确的分散磁激发观察。与母体化合物的磁色散相比，掺杂后的磁激发演化具有高度的各向异性。沿波腹方向，色散几乎是完整的。另一方面，沿节点方向的磁激励显示出明显的软化。这些结果建立了强磁关联的存在下，在电子掺杂的Sr $_{1-x}$ La $_x$）$_2$ IrO $_4$与密切类似的空穴掺杂的铜氧化物，进一步激发了高温超导在这个系统中的搜索。
英文摘要：
The magnetic excitations in electron doped (Sr$_{1-x}$La$_x$)$_2$IrO$_4$ with $x = 0.03$ were measured using resonant inelastic X-ray scattering at the Ir $L_3$-edge. Although much broadened, well defined dispersive magnetic excitations were observed. Comparing with the magnetic dispersion from the parent compound, the evolution of the magnetic excitations upon doping is highly anisotropic. Along the anti-nodal direction, the dispersion is almost intact. On the other hand, the magnetic excitations along the nodal direction show significant softening. These results establish the presence of strong magnetic correlations in electron doped Sr$_{1-x}$La$_x$)$_2$IrO$_4$ with close analogies to the hole doped cuprates, further motivating the search for high temperature superconductivity in this system.
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