Pressure-induced electronic and magnetic phase transitions in a Mott insulator: Ti-doped C a3 R u2 O7 bilayer ruthenate

T. Zou, H. B. Cao, G. Q. Liu, J. Peng, M. Gottschalk, M. Zhu, Y. Zhao, J. B. Leão, W. Tian, Z. Q. Mao, X. Ke

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Abstract

We report the hydrostatic pressure-induced electronic and magnetic phase transitions in a Mott insulator, a bilayer ruthenate Ca3(Ru0.97Ti0.03)2O7, via electronic transport and single crystal neutron diffraction measurements. The system undergoes an insulator-metal transition at a very small hydrostatic pressure ≈0.04 GPa, followed by a magnetic phase transition around 0.3 GPa, suggesting that the low energy charge fluctuation and magnetic ordering couple to the pressure separately in this compound. The ab initio calculations show that the suppressed RuO6 flattening induced by the pressure reduces the orbital polarization and gives rise to an insulator-metal transition preceding the magnetic phase transition.

Original languageEnglish (US)
Article number041115
JournalPhysical Review B
Volume94
Issue number4
DOIs
StatePublished - Jul 27 2016

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Zou, T., Cao, H. B., Liu, G. Q., Peng, J., Gottschalk, M., Zhu, M., Zhao, Y., Leão, J. B., Tian, W., Mao, Z. Q., & Ke, X. (2016). Pressure-induced electronic and magnetic phase transitions in a Mott insulator: Ti-doped C a3 R u2 O7 bilayer ruthenate. Physical Review B, 94(4), [041115]. https://doi.org/10.1103/PhysRevB.94.041115