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Magnetic excitations in hole-doped Sr_2IrO_4: Comparison with electron-doped cuprates

机译：空穴掺杂SR_2IRO_4中的磁激发：与电子掺杂铜酸盐的比较

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摘要

We have studied the evolution of magnetic and orbital excitations as a function of hole doping in single-crystal samples of Sr2Ir1-xRhxO4 (0.07 = x = 0.42) using high-resolution Ir L-3-edge resonant inelastic x-ray scattering. Within the antiferromagnetically ordered region of the phase diagram (x = 0.17) we observe highly dispersive magnon and spin-orbit exciton modes. Interestingly, both the magnon gap energy and the magnon bandwidth appear to increase as a function of doping, resulting in a hardening of the magnon mode with increasing hole doping. As a result, the observed spin dynamics of hole-doped iridates more closely resemble those of the electron-doped, rather than hole-doped, cuprates. Within the paramagnetic region of the phase diagram (0.17 = x = 0.42) the low-lying magnon mode disappears, and we find no evidence of spin fluctuations in this regime. In addition, we observe that the orbital excitations become essentially dispersionless in the paramagnetic phase, indicating that magnetic order plays a crucial role in the propagation of the spin-orbit exciton.
机译：我们已经研究了使用高分辨率IR L-3边缘谐振非弹性X射线散射在SR2IR1-XRHXO4（0.07 <= <= 0.42）的单晶样品中掺杂的空穴掺杂的磁性和轨道激发的演变。在相图的反铁磁性有序区域内（x <= 0.17），我们观察高度分散的肿瘤和旋转轨道兴奋模式。有趣的是，Magnon间隙能量和菱镁带宽似乎随着掺杂的函数而增加，导致MAGNON模式的硬化随着孔的掺杂增加。结果，观察到的孔掺杂虹膜的旋转动态更紧密地类似于电子掺杂的，而不是掺杂的铜铜。在相图的顺磁区域内（0.17 <= x <= 0.42），低位菱形模式消失，并且没有发现该制度中的旋转波动的证据。此外，我们观察到，轨道激发在顺磁相中基本上是无规模的，表明磁场在旋转轨道激子的繁殖中起着至关重要的作用。

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  • 来源
    《Physical review》 |2019年第10期|104414.1-104414.9|共9页
  • 作者

    Clancy J. P.; Gretarsson H.; Upton M. H.; Kim Jungho; Cao G.; Kim Young-June;

  • 作者单位

    Univ Toronto Dept Phys Toronto ON M5S 1A7 Canada;

    Univ Toronto Dept Phys Toronto ON M5S 1A7 Canada;

    Argonne Natl Lab Adv Photon Source Argonne IL 60439 USA;

    Argonne Natl Lab Adv Photon Source Argonne IL 60439 USA;

    Univ Colorado Dept Phys Boulder CO 80309 USA;

    Univ Toronto Dept Phys Toronto ON M5S 1A7 Canada;

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