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Title: Perovskite magnet with quantum mechanical glassiness

Abstract

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.

Authors:
ORCiD logo [1];  [1];  [2];  [3];  [1]; ORCiD logo [4];  [5];  [1]
  1. Univ. of Missouri, Columbia, MO (United States)
  2. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States). Center for Neutron Research; Univ. of Maryland, College Park, MD (United States)
  3. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States). Center for Neutron Research
  4. Rzeszów Univ. of Technology, Rzeszów (Poland)
  5. Max-Planck-Inst. für Mikrostrukturphysik, Halle (Germany)
Publication Date:
Research Org.:
Univ. of Missouri, Columbia, MO (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Center in Poland
OSTI Identifier:
1594066
Alternate Identifier(s):
OSTI ID: 1605613
Grant/Contract Number:  
SC0014461; DEC-2017/27/B/ST3/02881
Resource Type:
Accepted Manuscript
Journal Name:
Materials Today Physics
Additional Journal Information:
Journal Volume: 12; Journal ID: ISSN 2542-5293
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Perovskite; Magnetic quantum fluctuation; Spin glass; Quantum spin liquid

Citation Formats

Chen, Y., Dahal, A., Rodriguez-Rivera, J. A., Xu, G., Heitmann, T. W., Dugaev, V., Ernst, A., and Singh, D. K. Perovskite magnet with quantum mechanical glassiness. United States: N. p., 2019. Web. doi:10.1016/j.mtphys.2019.100163.
Chen, Y., Dahal, A., Rodriguez-Rivera, J. A., Xu, G., Heitmann, T. W., Dugaev, V., Ernst, A., & Singh, D. K. Perovskite magnet with quantum mechanical glassiness. United States. https://doi.org/10.1016/j.mtphys.2019.100163
Chen, Y., Dahal, A., Rodriguez-Rivera, J. A., Xu, G., Heitmann, T. W., Dugaev, V., Ernst, A., and Singh, D. K. Mon . "Perovskite magnet with quantum mechanical glassiness". United States. https://doi.org/10.1016/j.mtphys.2019.100163. https://www.osti.gov/servlets/purl/1594066.
@article{osti_1594066,
title = {Perovskite magnet with quantum mechanical glassiness},
author = {Chen, Y. and Dahal, A. and Rodriguez-Rivera, J. A. and Xu, G. and Heitmann, T. W. and Dugaev, V. and Ernst, A. and Singh, D. K.},
abstractNote = {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 TG≃ 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.},
doi = {10.1016/j.mtphys.2019.100163},
journal = {Materials Today Physics},
number = ,
volume = 12,
place = {United States},
year = {2019},
month = {12}
}

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