Persistent non-metallic behavior in Sr2IrO4 and Sr3Ir2O7 at high pressures

D. A. Zocco; J. J. Hamlin; B. D. White; B. J. Kim; J. R. Jeffries; S. T. Weir; Y. K. Vohra; J. W. Allen; M. B. Maple

doi:10.1088/0953-8984/26/25/255603

Persistent non-metallic behavior in Sr2IrO4 and Sr3Ir2O7 at high pressures

Strongly Correlated Electrons 2014-06-05 v2

Authors: D. A. Zocco , J. J. Hamlin , B. D. White , B. J. Kim , J. R. Jeffries , S. T. Weir , Y. K. Vohra , J. W. Allen , M. B. Maple

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Abstract

Iridium-based 5d transition-metal oxides are attractive candidates for the study of correlated electronic states due to the interplay of enhanced crystal-field, Coulomb and spin-orbit interaction energies. At ambient pressure, these conditions promote a novel Jeff = 1/2 Mott insulating state, characterized by a gap of the order of ~0.1 eV. We present high-pressure electrical resistivity measurements of single crystals of Sr2IrO4 and Sr3Ir2O7. While no indications of a pressure-induced metallic state up to 55 GPa were found in Sr2IrO4, a strong decrease of the gap energy and of the resistance of Sr3Ir2O7 between ambient pressure and 104 GPa confirm that this compound is in the proximity of a metal-insulator transition.

Keywords

high-pressure phase transitions metal-insulator transition phase transitions

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@article{arxiv.1304.5864,
  title  = {Persistent non-metallic behavior in Sr2IrO4 and Sr3Ir2O7 at high pressures},
  author = {D. A. Zocco and J. J. Hamlin and B. D. White and B. J. Kim and J. R. Jeffries and S. T. Weir and Y. K. Vohra and J. W. Allen and M. B. Maple},
  journal= {arXiv preprint arXiv:1304.5864},
  year   = {2014}
}

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5 pages, 4 figures

Persistent non-metallic behavior in Sr2IrO4 and Sr3Ir2O7 at high pressures

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