Perovskite magnet with quantum mechanical glassiness

Chen, Y.; Dahal, A.; Rodriguez-Rivera, J. A.; Xu, G.; Heitmann, T. W.; Dugaev, V.; Ernst, A.; Singh, D. K.

doi:10.1016/j.mtphys.2019.100163

Title: Perovskite magnet with quantum mechanical glassiness

Journal Article · Mon Dec 02 00:00:00 EST 2019 · Materials Today Physics

DOI:https://doi.org/10.1016/j.mtphys.2019.100163· OSTI ID:1594066

^[1]; Dahal, A. ^[1]; Rodriguez-Rivera, J. A. ^[2]; Xu, G. ^[3]; Heitmann, T. W. ^[1];

^[4]; Ernst, A. ^[5]; Singh, D. K. ^[1]

Univ. of Missouri, Columbia, MO (United States)
National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States). Center for Neutron Research; Univ. of Maryland, College Park, MD (United States)
National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States). Center for Neutron Research
Rzeszów Univ. of Technology, Rzeszów (Poland)
Max-Planck-Inst. für Mikrostrukturphysik, Halle (Germany)

Magnetic materials of strongly correlated origin are at the forefront of research in the exploration of new quantum mechanical properties involving spin and charges. Quantum magnetic material with certain intrinsic functionalities, such as continuously fluctuating spins to the lowest accessible temperature - reminiscing a liquid pattern, is argued to form a new phase of matter. Envisaging a phenomenon where the continuously fluctuating spins are also randomly frozen in space, can diminish the distinction between the two opposite extremes of quantum and classical magnetism. Here, we report new evidence in this regard where the coexistence of quantum spin continuum with a spin glass order in Co-doped CaRuO3 perovskite is demonstrated. In experimental investigations of Co-doped CaRuO3 perovskite, we find that (a) a continuum spectrum in the energy-momentum space, due to the uncorrelated spin fluctuations, persists across the weak spin glass transition at $T_{G} ≃$ 23 K and (b) the quantum fluctuation of magnetic moment is spatially confined to individual sites only, thereby making it an extremely local event. Thus, the fluctuating spins, at a given time, are also randomly frozen macroscopically. The experimental observations suggest the discovery of a new magnetic phase at the cross-road of classical and quantum physics in strongly correlated perovskite materials.

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Research Organization:: Univ. of Missouri, Columbia, MO (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Center in Poland

Grant/Contract Number:: SC0014461; DEC-2017/27/B/ST3/02881

OSTI ID:: 1594066

Alternate ID(s):: OSTI ID: 1605613

Journal Information:: Materials Today Physics, Vol. 12; ISSN 2542-5293

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 1 work

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References (40)

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36 MATERIALS SCIENCE
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