Quantum continuum fluctuations in glassy perovskite Ca(Co<sub>0.15</sub>Ru<sub>0.85</sub>)O<sub>3</sub>

ORAL

Abstract

The quantum spin continuum and classical spin freezing, associated with a glassy state, represent two opposite extremes of a correlated electronic material. Here, we report the coexistence of a quantum spin continuum with a weak spin glass order in Co-doped CaRuO3 perovskite near the chemical doping dependent metal-insulator transition boundary. Inelastic neutron measurements on Ca(Co0.15Ru0.85)O3 at low temperature, T = 1.5 K, reveal a continuum spectrum in the Q-E space due to uncorrelated spin fluctuations. This persists across the glass transition at TG~23 K. Furthermore, scaling of the dynamic susceptibility yields a very small scaling coefficient α~ 0.1, suggesting extreme locality of the dynamic properties. The experimental results indicate the realization of a narrow regime where the distinction between continuum dynamic behavior and glass-like regimes is reduced.

*The research at MU is supported by DOE, Office of Basic Energy Sciences under grant no. DE-SC0014461.

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Presenters

  • Deepak K Singh

    • Department of Physics and Astronomy, University of Missouri

Authors

  • Deepak K Singh

    • Department of Physics and Astronomy, University of Missouri

  • Yiyao Chen

    • Department of Physics and Astronomy, University of Missouri

  • Ashutosh Dahal

    • Department of Physics and Astronomy, University of Missouri

  • Jose A Rodriguez

    • NIST Center for Neutron Research
    • NIST
    • NIST Center for Neutron Research, National Institute of Standards and Technology

  • Guangyong Xu

    • NIST Center for Neutron Research, National Institute of Standards and Technology
    • National Institute of Standards and Technology
    • NCNR, NIST
    • NIST Center for Neutron Research

  • Thomas Heitmann

    • University of Missouri
    • University of Missouri Research Reactor, University of Missouri
    • The Missouri Research Reactor, University of Missouri

  • Vitalii Dugaev

    • Department of Physics and Medical Engineering, Rzeszow University of Technology

  • Arthur Ernst

    • Max-Planck-Institut fur Mikrostrukturphysik, Weinberg 2, D-06120 Halle, Germany
    • Max Planck Institute of Microstructure Physics