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Nature of the ferromagnet-paramagnet transition in the hole-doped Mott insulator Y<sub>1-x</sub>Ca<sub>x</sub>TiO<sub>3</sub>

ORAL

Abstract

The perovskite titanate class of materials encompasses a wide variety of phenomena, including magnetic phase transitions, insulator-metal transitions, and superconductivity. In this talk, I will present our findings from neutron scattering, muon spin rotation and magnetic susceptibility measurements of the magnetically-ordered ground states and spin dynamics of the hole-doped Mott insulator Y1-xCaxTiO3. This system is known to exhibit an intriguing transition from ferromagnetic to paramagnetic state at x ~ 0.2 prior to undergoing an insulator-metal transition at x ~ 0.35 [1,2]. We find that the ferromagnetic phase extends into significantly higher hole-doping levels than previously reported and determine a first-order nature for the doping-induced ferromagnet-paramagnetic transition.



[1] S. Hameed et al., Phys. Rev. Mater. 5, 125003 (2021)

[2] S. Hameed et al., Phys. Rev. B 104, 045112 (2021) [Erratum: Phys. Rev. B 105, 159902 (2022)]

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Presenters

  • Sajna Hameed

    Max Planck Institute for Solid State Research

Authors

  • Sajna Hameed

    Max Planck Institute for Solid State Research

  • Issam Khayr

    University of Minnesota, Twin Cities, University of Minnesota

  • Joseph Joe

    University of Minnesota, University of Minnesota Twin Cities

  • Yipeng Cai

    University of British Columbia

  • Guoqiang Zhao

    Department of Environmental Science, Zhejiang University, Hangzhou 310058, China, Institute of Physics Chinese Academy of Sciences

  • Qi Sheng

    Department of Physics, Columbia University

  • Kohtaro Yamakawa

    University of California, Berkeley

  • Jiawei Zang

    Columbia University

  • Changqing Jin

    Chinese Academy of Sciences

  • Lichen Fu

    Department of Physics, Zhejiang University, Hangzhou 310027, China

  • Yilin Gu

    Department of Physics, Zhejiang University, Hangzhou 310027, China

  • Fanlong Ning

    Department of Physics, Zhejiang University, Hangzhou 310027, China

  • Songxue Chi

    Oak Ridge National Lab

  • Peter M Gehring

    National Institute of Standards and Technology

  • Travis J Williams

    Oak Ridge National Lab, Oak Ridge National Laboratory

  • Zhijun Xu

    University of Maryland, College Park

  • Masaaki Matsuda

    Oak Ridge National Lab

  • Kenji M Kojima

    University of British Columbia

  • Yasutomo J Uemura

    Columbia Univ

  • Martin Greven

    University of Minnesota