Quantum Magnetic Properties in Perovskite with Anderson Localized Artificial Spin‐1/2

Gunasekera, Jagath; Dahal, Ashutosh; Chen, Yiyao; Rodriguez‐Rivera, Jose A.; Harriger, Leland W.; Thomas, Stefan; Heitmann, Thomas W.; Dugaev, Vitalii; Ernst, Arthur; Singh, Deepak K.

doi:10.1002/advs.201700978

Title: Quantum Magnetic Properties in Perovskite with Anderson Localized Artificial Spin‐1/2

Journal Article · Fri Mar 02 00:00:00 EST 2018 · Advanced Science

DOI:https://doi.org/10.1002/advs.201700978· OSTI ID:1423485

Gunasekera, Jagath ^[1]; Dahal, Ashutosh ^[1]; Chen, Yiyao ^[1]; Rodriguez‐Rivera, Jose A. ^[2]; Harriger, Leland W. ^[3]; Thomas, Stefan ^[4]; Heitmann, Thomas W. ^[5]; Dugaev, Vitalii ^[6]; Ernst, Arthur ^[7]; Singh, Deepak K. ^[1]

Department of Physics and Astronomy University of Missouri Columbia MO 65211‐7010 USA
NIST Center for Neutron Research Gaithersburg MD 20878 USA, Department of Materials Science and Engineering University of Maryland College Park MD 20742 USA
NIST Center for Neutron Research Gaithersburg MD 20878 USA
Max‐Planck‐Institut für Mikrostrukturphysik Weinberg 2 06120 Halle Germany
University of Missouri Research Reactor Columbia MO 65211 USA
Department of Physics and Medical Engineering Rzeszów University of Technology 35‐959 Rzeszów Poland
Max‐Planck‐Institut für Mikrostrukturphysik Weinberg 2 06120 Halle Germany, Institut für Theoretische Physik Johannes Kepler Universität 4040 Linz Austria

Abstract Quantum magnetic properties in a geometrically frustrated lattice of spin‐1/2 magnet, such as quantum spin liquid or solid and the associated spin fractionalization, are considered key in developing a new phase of matter. The feasibility of observing the quantum magnetic properties, usually found in geometrically frustrated lattice of spin‐1/2 magnet, in a perovskite material with controlled disorder is demonstrated. It is found that the controlled chemical disorder, due to the chemical substitution of Ru ions by Co‐ions, in a simple perovskite CaRuO ₃ creates a random prototype configuration of artificial spin‐1/2 that forms dimer pairs between the nearest and further away ions. The localization of the Co impurity in the Ru matrix is analyzed using the Anderson localization formulation. The dimers of artificial spin‐1/2, due to the localization of Co impurities, exhibit singlet‐to‐triplet excitation at low temperature without any ordered spin correlation. The localized gapped excitation evolves into a gapless quasi‐continuum as dimer pairs break and create freely fluctuating fractionalized spins at high temperature. Together, these properties hint at a new quantum magnetic state with strong resemblance to the resonance valence bond system.

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

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: DE‐SC0014461; SC0014461

OSTI ID:: 1423485

Alternate ID(s):: OSTI ID: 1423486; OSTI ID: 1499006

Journal Information:: Advanced Science, Journal Name: Advanced Science Vol. 5 Journal Issue: 5; ISSN 2198-3844

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: Germany

Language:: English

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Cited by: 3 works

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74 ATOMIC AND MOLECULAR PHYSICS
Anderson localization
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Title: Quantum Magnetic Properties in Perovskite with Anderson Localized Artificial Spin‐1/2

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