论文标题
掺杂RH2IRO4中的自旋波间隙崩溃
Spin-wave gap collapse in Rh-doped Sr2IrO4
论文作者
论文摘要
我们在IR L3边缘使用共振非弹性X射线散射（RIX）来研究掺杂孔对SR2IRO4中jeff = 1/2 mott ul的影响，通过RH的替换IR位点。与XY型自旋交换各向异性相关的自旋波间隙在抑制Mott构造状态之前与RH含量的增加崩溃，并且与通过SR位点的LA替代的电子掺杂相反。同时，尽管进行了严重的阻尼，但D-D激发光谱仍保留其整体振幅和分散特征。对自旋波谱的仔细研究表明，用于模拟原始系统的J1-J2-J3 Heisenberg的偏差在中间掺杂水平上消失。这些发现是根据对附近IR波函数的影响IR-IR相关性的调节来解释的，即使单波段Jeff = 1/2模型仍然有效到全载体定位。它们强调了掺杂伪源系统（如SR2IRO4）时过渡金属位点对称性的重要性。
We use resonant inelastic x-ray scattering (RIXS) at the Ir L3 edge to study the effect of hole doping upon the Jeff=1/2 Mott-insulating state in Sr2IrO4, via Rh replacement of the Ir site. The spin-wave gap, associated with XY-type spin-exchange anisotropy, collapses with increasing Rh content, prior to the suppression of the Mott-insulating state and in contrast to electron doping via La substitution of the Sr site. At the same time, despite heavy damping, the d-d excitation spectra retain their overall amplitude and dispersion character. A careful study of the spin-wave spectrum reveals that deviations from the J1-J2-J3 Heisenberg used to model the pristine system disappear at intermediate doping levels. These findings are interpreted in terms of a modulation of Ir-Ir correlations due to the influence of Rh impurities upon nearby Ir wave functions, even as the single-band Jeff=1/2 model remains valid up to full carrier delocalization. They underline the importance of the transition metal site symmetry when doping pseudospin systems such as Sr2IrO4.
