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

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 CaRuO3 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. Furthermore, 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.

Authors:
 [1];  [1];  [1];  [2];  [3];  [4];  [5];  [6];  [7];  [1]
  1. Department of Physics and Astronomy, University of Missouri, Columbia MO 65211-7010 USA
  2. NIST Center for Neutron Research, Gaithersburg MD 20878 USA, Department of Materials Science and Engineering, University of Maryland, College Park MD 20742 USA
  3. NIST Center for Neutron Research, Gaithersburg MD 20878 USA
  4. Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2 06120 Halle Germany
  5. University of Missouri Research Reactor, Columbia MO 65211 USA
  6. Department of Physics and Medical Engineering, Rzeszów University of Technology, 35-959 Rzeszów Poland
  7. Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2 06120 Halle Germany, Institut für Theoretische Physik, Johannes Kepler Universität, 4040 Linz Austria
Publication Date:
Research Org.:
Univ. of Missouri, Columbia, MO (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1423485
Alternate Identifier(s):
OSTI ID: 1423486; OSTI ID: 1499006
Grant/Contract Number:  
SC0014461
Resource Type:
Published Article
Journal Name:
Advanced Science
Additional Journal Information:
Journal Name: Advanced Science Journal Volume: 5 Journal Issue: 5; Journal ID: ISSN 2198-3844
Publisher:
Wiley Blackwell (John Wiley & Sons)
Country of Publication:
Germany
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; Anderson localization; perovskites; singlet-triplet transitions; quantum magnetism

Citation Formats

Gunasekera, Jagath, Dahal, Ashutosh, Chen, Yiyao, Rodriguez-Rivera, Jose A., Harriger, Leland W., Thomas, Stefan, Heitmann, Thomas W., Dugaev, Vitalii, Ernst, Arthur, and Singh, Deepak K. Quantum Magnetic Properties in Perovskite with Anderson Localized Artificial Spin-1/2. Germany: N. p., 2018. Web. doi:10.1002/advs.201700978.
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. Quantum Magnetic Properties in Perovskite with Anderson Localized Artificial Spin-1/2. Germany. doi:10.1002/advs.201700978.
Gunasekera, Jagath, Dahal, Ashutosh, Chen, Yiyao, Rodriguez-Rivera, Jose A., Harriger, Leland W., Thomas, Stefan, Heitmann, Thomas W., Dugaev, Vitalii, Ernst, Arthur, and Singh, Deepak K. Fri . "Quantum Magnetic Properties in Perovskite with Anderson Localized Artificial Spin-1/2". Germany. doi:10.1002/advs.201700978.
@article{osti_1423485,
title = {Quantum Magnetic Properties in Perovskite with Anderson Localized Artificial Spin-1/2},
author = {Gunasekera, Jagath and Dahal, Ashutosh and Chen, Yiyao and Rodriguez-Rivera, Jose A. and Harriger, Leland W. and Thomas, Stefan and Heitmann, Thomas W. and Dugaev, Vitalii and Ernst, Arthur and Singh, Deepak K.},
abstractNote = {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 CaRuO3 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. Furthermore, 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.},
doi = {10.1002/advs.201700978},
journal = {Advanced Science},
number = 5,
volume = 5,
place = {Germany},
year = {2018},
month = {3}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1002/advs.201700978

Figures / Tables:

Figure 1 Figure 1: Controlled disorder and making of spin-1/2 moment. a) Schematic of random Ru-substitution by Co-ion in CaRuO3. At the substitution coefficient of x > 8.3%, at least one Ru-ion is replaced by Co-ion in the lattice unit cell, on the average, that are randomly distributed; necessary to create dimersmore » with varying exchange constants. Oval depicts a dimer formation. b) Calculation of the spin density of opposite polarity confirms that the net moment of Co-ion is comparable to the moment of spin-1/2 system. c) Calculated spin wave dispersion relation in Co-substituted CaRuO3, at x = 0.2, confirms the formation of singlet Co dimers, as schematically shown in (a).« less

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    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.