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Title: Destabilization of Magnetic Order in a Dilute Kitaev Spin Liquid Candidate

Abstract

The insulating honeycomb magnet α–RuCl 3 exhibits fractionalized excitations that signal its proximity to a Kitaev quantum spin liquid state; however, at T=0, fragile long-range magnetic order arises from non-Kitaev terms in the Hamiltonian. Spin vacancies in the form of Ir 3+ substituted for Ru are found to destabilize this long-range order. Neutron diffraction and bulk characterization of Ru 1–xIr xCl 3 show that the magnetic ordering temperature is suppressed with increasing x, and evidence of zizag magnetic order is absent for x > 0.3. Inelastic neutron scattering demonstrates that the signature of fractionalized excitations is maintained over the full range of x investigated. In conclusion, the depleted lattice without magnetic order thus hosts a spin-liquid-like ground state that may indicate the relevance of Kitaev physics in the magnetically dilute limit of RuCl 3.

Authors:
 [1]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2];  [1]
  1. Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1413606
DOE Contract Number:  
AC05-00OR22725
Resource Type:
Journal Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 119; Journal Issue: 23; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Lampen-Kelley, Paige, Banerjee, Arnab, Aczel, Adam A., Cao, H. B., Stone, Matthew B., Bridges, Craig A., Yan, J. -Q., Nagler, Stephen E., and Mandrus, David. Destabilization of Magnetic Order in a Dilute Kitaev Spin Liquid Candidate. United States: N. p., 2017. Web. doi:10.1103/PhysRevLett.119.237203.
Lampen-Kelley, Paige, Banerjee, Arnab, Aczel, Adam A., Cao, H. B., Stone, Matthew B., Bridges, Craig A., Yan, J. -Q., Nagler, Stephen E., & Mandrus, David. Destabilization of Magnetic Order in a Dilute Kitaev Spin Liquid Candidate. United States. doi:10.1103/PhysRevLett.119.237203.
Lampen-Kelley, Paige, Banerjee, Arnab, Aczel, Adam A., Cao, H. B., Stone, Matthew B., Bridges, Craig A., Yan, J. -Q., Nagler, Stephen E., and Mandrus, David. Wed . "Destabilization of Magnetic Order in a Dilute Kitaev Spin Liquid Candidate". United States. doi:10.1103/PhysRevLett.119.237203.
@article{osti_1413606,
title = {Destabilization of Magnetic Order in a Dilute Kitaev Spin Liquid Candidate},
author = {Lampen-Kelley, Paige and Banerjee, Arnab and Aczel, Adam A. and Cao, H. B. and Stone, Matthew B. and Bridges, Craig A. and Yan, J. -Q. and Nagler, Stephen E. and Mandrus, David},
abstractNote = {The insulating honeycomb magnet α–RuCl3 exhibits fractionalized excitations that signal its proximity to a Kitaev quantum spin liquid state; however, at T=0, fragile long-range magnetic order arises from non-Kitaev terms in the Hamiltonian. Spin vacancies in the form of Ir3+ substituted for Ru are found to destabilize this long-range order. Neutron diffraction and bulk characterization of Ru1–xIrxCl3 show that the magnetic ordering temperature is suppressed with increasing x, and evidence of zizag magnetic order is absent for x > 0.3. Inelastic neutron scattering demonstrates that the signature of fractionalized excitations is maintained over the full range of x investigated. In conclusion, the depleted lattice without magnetic order thus hosts a spin-liquid-like ground state that may indicate the relevance of Kitaev physics in the magnetically dilute limit of RuCl3.},
doi = {10.1103/PhysRevLett.119.237203},
journal = {Physical Review Letters},
issn = {0031-9007},
number = 23,
volume = 119,
place = {United States},
year = {2017},
month = {12}
}

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