Pressure-induced electronic and magnetic phase transitions in a Mott insulator: Ti-doped $\mathrm{C}{\mathrm{a}}_{3}\mathrm{R}{\mathrm{u}}_{2}{\mathrm{O}}_{7}$ bilayer ruthenate

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Pressure-induced electronic and magnetic phase transitions in a Mott insulator: Ti-doped $C a_{3} R u_{2} O_{7}$ 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, and X. Ke

Phys. Rev. B 94, 041115(R) – Published 27 July 2016

Abstract

We report the hydrostatic pressure-induced electronic and magnetic phase transitions in a Mott insulator, a bilayer ruthenate $C a_{3} {(R u_{0.97} T i_{0.03})}_{2} O_{7}$ , 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 $a b$ initio calculations show that the suppressed $Ru O_{6}$ flattening induced by the pressure reduces the orbital polarization and gives rise to an insulator-metal transition preceding the magnetic phase transition.

Received 9 May 2016
Revised 16 June 2016

DOI:https://doi.org/10.1103/PhysRevB.94.041115

Physics Subject Headings (PhySH)

Metal-insulator transition Pressure effects

Mott insulators Ruthenates

Neutron diffraction

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

T. Zou¹, H. B. Cao², G. Q. Liu³, J. Peng^4,5, M. Gottschalk¹, M. Zhu¹, Y. Zhao^6,7, J. B. Leão⁶, W. Tian², Z. Q. Mao⁴, and X. Ke^1,*

¹Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
²Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
³Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China
⁴Department of Physics and Engineering Physics, Tulane University, New Orleans, Louisiana 70118, USA
⁵Collaborative Innovation Center of Advanced Microstructures, Laboratory of Solid State Microstructures, School of Physics, Nanjing University, Nanjing 210093, China
⁶NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
⁷Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742, USA

^*Corresponding author: ke@pa.msu.edu

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Vol. 94, Iss. 4 — 15 July 2016

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Physical Review B

covering condensed matter and materials physics

Pressure-induced electronic and magnetic phase transitions in a Mott insulator: Ti-doped $C a_{3} R u_{2} O_{7}$ 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, and X. Ke

Phys. Rev. B 94, 041115(R) – Published 27 July 2016

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Physical Review B

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Pressure-induced electronic and magnetic phase transitions in a Mott insulator: Ti-doped Ca3Ru2O7 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, and X. Ke

Phys. Rev. B 94, 041115(R) – Published 27 July 2016

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Pressure-induced electronic and magnetic phase transitions in a Mott insulator: Ti-doped $C a_{3} R u_{2} O_{7}$ bilayer ruthenate