Spin-wave gap collapse in Rh-doped Sr2IrO4
| Autor: | Bertinshaw, J., Kim, J. K., Porras, J., Ueda, K., Sung, N. H., Efimenko, A., Bombardi, A., Kim, Jungho, Keimer, B., Kim, B. J. |
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| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | Physical Review B, 101, 094428 (2020) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevB.101.094428 |
| Popis: | 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. Comment: 5 pages, 3 figures |
| Databáze: | arXiv |
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