skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Non-magnetic ion site disorder effects on the quantum magnetism of a spin-1/2 equilateral triangular lattice antiferromagnet

Journal Article · · Journal of Physics. Condensed Matter
ORCiD logo [1];  [1];  [2];  [3];  [4];  [4]; ORCiD logo [5]; ORCiD logo [6]; ORCiD logo [7]; ORCiD logo [7];  [7];  [8];  [9];  [9];  [10]
  1. Univ. of Tennessee, Knoxville, TN (United States)
  2. Rutgers Univ., Piscataway, NJ (United States)
  3. Florida State Univ., Tallahassee, FL (United States)
  4. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  5. Univ. of Manitoba, Winnipeg, MB (Canada)
  6. Univ. of Manitoba, Winnipeg (Canada); Univ. of Winnipeg, Manitoba (Canada)
  7. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  8. Shanghai Jiao Tong Univ. (China); Chinese Academy of Sciences (CAS), Shenyang (China)
  9. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
  10. Univ. of Tennessee, Knoxville, TN (United States); Florida State Univ., Tallahassee, FL (United States)

Here, with the motivation to study how non-magnetic ion site disorder affects the quantum magnetism of Ba3CoSb2O9, a spin-1/2 equilateral triangular lattice antiferromagnet, we performed DC and AC susceptibility, specific heat, elastic and inelastic neutron scattering measurements on single crystalline samples of Ba2.87Sr0.13CoSb2O9 with Sr doping on non-magnetic Ba2+ ion sites. The results show that Ba2.87Sr0.13CoSb2O9 exhibits (i) a two-step magnetic transition at 2.7 K and 3.3 K, respectively; (ii) a possible canted 120 degree spin structure at zero field with reduced ordered moment as 1.24 μB/Co; (iii) a series of spin state transitions for both H∥ab-plane and H∥c-axis. For H∥ab-plane, the magnetization plateau feature related to the up–up–down phase is significantly suppressed; (iv) an inelastic neutron scattering spectrum with only one gapped mode at zero field, which splits to one gapless and one gapped mode at 9 T. All these features are distinctly different from those observed for the parent compound Ba3CoSb2O9, which demonstrates that the non-magnetic ion site disorder (the Sr doping) plays a complex role on the magnetic properties beyond the conventionally expected randomization of the exchange interactions. We propose the additional effects including the enhancement of quantum spin fluctuations and introduction of a possible spatial anisotropy through the local structural distortions.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); National Science and Engineering Research Council (NSERC); Canadian Foundation for Innovation (CFI); Beckman Young Investigator Award; National Science Foundation of China
Grant/Contract Number:
AC05-00OR22725; DMR-2003117; DMR-1157490; DMR-1508249; 11774223; U2032213
OSTI ID:
1872842
Journal Information:
Journal of Physics. Condensed Matter, Vol. 34, Issue 20; ISSN 0953-8984
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English

References (47)

Randomness-Induced Quantum Spin Liquid Behavior in the s = 1 / 2 Random-Bond Heisenberg Antiferromagnet on the Pyrochlore Lattice journal August 2019
Spin liquid nature in the Heisenberg J 1 J 2 triangular antiferromagnet journal April 2016
Quantum Spin-Liquid Behavior in the Spin-1/2 Random Heisenberg Antiferromagnet on the Triangular Lattice journal March 2014
Random-Singlet Phase in Disordered Two-Dimensional Quantum Magnets journal December 2018
Observation of a random singlet state in a diluted Kitaev honeycomb material journal September 2020
Quantum Spin-Liquid Behavior in the Spin-1/2 Random-Bond Heisenberg Antiferromagnet on the Kagome Lattice journal October 2014
Evidence for a spinon Fermi surface in a triangular-lattice quantum-spin-liquid candidate journal December 2016
Synthesis, Structure, and Physical Properties of Cobalt Perovskites: Sr3CoSb2O9 and Sr2CoSbO6−δ journal February 2001
Quasiclassical magnetic order and its loss in a spin- 1 2 Heisenberg antiferromagnet on a triangular lattice with competing bonds journal January 2015
Ground states of spin- 1 2 triangular antiferromagnets in a magnetic field journal April 2013
Rearrangement of Uncorrelated Valence Bonds Evidenced by Low-Energy Spin Excitations in YbMgGaO 4 journal April 2019
Nature of the randomness-induced quantum spin liquids in two dimensions journal September 2019
Static and dynamical spin correlations of the S = 1 2 random-bond antiferromagnetic Heisenberg model on the triangular and kagome lattices journal October 2015
Nearest-neighbour resonating valence bonds in YbMgGaO4 journal June 2017
Field-induced decays in XXZ triangular-lattice antiferromagnets journal October 2016
Crystalline Electric-Field Randomness in the Triangular Lattice Spin-Liquid YbMgGaO 4 journal March 2017
Competing spin-liquid states in the spin- 1 2 Heisenberg model on the triangular lattice journal October 2015
Absence of moment fragmentation in the mixed B -site pyrochlore Nd 2 GaSbO 7 journal June 2021
Finite-temperature behavior of a classical spin-orbit-coupled model for YbMgGaO 4 with and without bond disorder journal May 2018
Signatures of a Spin- 1 2 Cooperative Paramagnet in the Diluted Triangular Lattice of Y 2 CuTiO 6 journal September 2020
Randomness-Induced Quantum Spin Liquid Behavior in the s = 1/2 Random J 1J 2 Heisenberg Antiferromagnet on the Honeycomb Lattice journal April 2017
Phases of a Triangular-Lattice Antiferromagnet Near Saturation journal August 2014
Lattice distortion effects on the frustrated spin-1 triangular-antiferromagnet A 3 NiN b 2 O 9 ( A = Ba , Sr, and Ca) journal September 2018
Fractionalized excitations in the partially magnetized spin liquid candidate YbMgGaO4 journal October 2018
Randomly Hopping Majorana Fermions in the Diluted Kitaev System α - Ru 0.8 Ir 0.2 Cl 3 journal January 2020
Gapless Spin-Liquid Phase in an Extended Spin 1/2 Triangular Heisenberg Model journal September 2014
DEMAND, a Dimensional Extreme Magnetic Neutron Diffractometer at the High Flux Isotope Reactor journal December 2018
Gapless quantum spin liquid ground state in the two-dimensional spin-1/2 triangular antiferromagnet YbMgGaO4 journal November 2015
Magnons and excitation continuum in XXZ triangular antiferromagnetic model: Application to Ba 3 CoSb 2 O 9 journal April 2015
Symmetry fractionalization in the topological phase of the spin- 1 2 J 1 J 2 triangular Heisenberg model journal September 2016
Quantum theory of an antiferromagnet on a triangular lattice in a magnetic field journal January 1991
Structure of the magnetic excitations in the spin-1/2 triangular-lattice Heisenberg antiferromagnet Ba3CoSb2O9 journal August 2017
MACS—a new high intensity cold neutron spectrometer at NIST journal January 2008
Continuous excitations of the triangular-lattice quantum spin liquid YbMgGaO4 journal December 2016
Survival of itinerant excitations and quantum spin state transitions in YbMgGaO4 with chemical disorder journal August 2021
Triangular antiferromagnets with a layered structure in a uniform field journal February 1997
Extreme Suppression of Antiferromagnetic Order and Critical Scaling in a Two-Dimensional Random Quantum Magnet journal January 2021
Magnetic and electric properties of triangular lattice antiferromagnets Ba3ATa2O9 (A= Ni and Co) journal April 2017
Avoided quasiparticle decay from strong quantum interactions journal May 2019
Scaling and data collapse from local moments in frustrated disordered quantum spin systems journal October 2018
Author Correction: The nature of spin excitations in the one-third magnetization plateau phase of Ba3CoSb2O9 journal August 2018
Randomness-induced quantum spin liquid behavior in the s = 1 2 random J 1 J 2 Heisenberg antiferromagnet on the square lattice journal October 2018
Random singlet state in Ba 5 CuIr 3 O 12 single crystals journal January 2020
Dynamical structure factor of the triangular-lattice antiferromagnet journal September 2013
Randomness-induced spin-liquid-like phase in the spin- 1 2   J 1 J 2 triangular Heisenberg model journal February 2019
Magnetoelastic coupling and the magnetization plateau in Ba 3 CoSb 2 O 9 journal March 2019
Freezing of a Disorder Induced Spin Liquid with Strong Quantum Fluctuations journal June 2021