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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    8 Scopus citations

    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
    Article number041115
    JournalPhysical Review B
    Volume94
    Issue number4
    DOIs
    StatePublished - Jul 27 2016

    Funding

    Work at Tulane University was supported by the U.S. Department of Energy (DOE) under Experimental Program to Stimulate Competitive Research (EPSCoR) Grant No. DE-SC0012432 with additional support from the Louisiana Board of Regents (support for crystal growth). Work at ORNL was supported by the Scientific User Facilities Division, Office of Basic Energy Sciences, DOE. J.P. was supported by the National Natural Science Foundation of China (Grant No. 11304149), and G.L. was supported by the National Natural Science Foundation of China (Grants No. 11204326 and No. 11474296). The identification of any commercial product or trade name does not imply endorsement or recommendation by the National Institute of Standards and Technology.

    FundersFunder number
    Scientific User Facilities Division
    U.S. Department of Energy
    National Institute of Standards and Technology
    Office of Experimental Program to Stimulate Competitive ResearchDE-SC0012432
    Office of Experimental Program to Stimulate Competitive Research
    Basic Energy Sciences
    Louisiana Board of Regents
    National Natural Science Foundation of China11304149, 11474296, 11204326
    National Natural Science Foundation of China

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