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A Comparison Study of the Effects of Ba and La Doping in Sr2IrO4: Ir–O–Ir Bond Angle and Carrier Concentration

Abstract

We perform a systematic investigation on the effects of Ba and La doping on the lattice and transport properties of Sr2IrO4, which is theoretically predicted to be a host compound of high-temperature superconductivity. We observe a drastic straightening of the Ir–O–Ir bond angle in the Ba-doped samples. The straightening of the bond angle is much weaker in the La-doped samples. It is found that the La doping leads to the introduction of electron-type charge carriers, while the charge carrier concentration does not change too much in the Ba-doped samples. As a result, both the resistivity and the magnetic moments decrease much faster in the La-doped samples, compared to those in the Ba-doped samples. The present results suggest that it is the charge carrier density rather than the Ir–O–Ir bond angle that dominates the magnetic and transport properties of the Sr2IrO4 system.

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Acknowledgments

This work was supported by the National Key Research and Development Program of China (Grant No. 2016YFA0300404), the National Natural Science Foundation of China (Grant Nos. U1532267, 51603207, 11674327 and 11504379), and the CASHIPS Director’s Fund (Grant No. YZJJ201516). T. Han and D.D. Liang contributed equally to this paper.

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Correspondence to W. K. Zhu or Changjin Zhang.

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Han, T., Liang, D., Wang, Y. et al. A Comparison Study of the Effects of Ba and La Doping in Sr2IrO4: Ir–O–Ir Bond Angle and Carrier Concentration. J Supercond Nov Magn 30, 3493–3496 (2017). https://doi.org/10.1007/s10948-017-4152-z

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  • DOI: https://doi.org/10.1007/s10948-017-4152-z

Keywords

  • High-temperature superconductivity
  • Ir–O–Ir bond angle
  • Charge carrier concentration
  • Sr2IrO4