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Title: Magnetic structure and dispersion relation of the S = 1 2 quasi-one-dimensional Ising-like antiferromagnet BaCo 2 V 2 O 8 in a transverse magnetic field

Here, BaCo 2V 2O 8 consists of Co chains in which a Co 2+ ion carries a fictitious spin 1/2 with Ising anisotropy. We performed elastic and inelastic neutron scattering experiments in BaCo 2V 2O 8 in a magnetic field perpendicular to the c axis which is the chain direction. With applying magnetic field along the a axis at 3.5 K, the antiferromagnetic order with the easy axis along the c axis, observed in zero magnetic field, is completely suppressed at 8 T, while the magnetic field gradually induces an antiferromagnetic order with the spin component along the b axis. We also studied magnetic excitations as a function of transverse magnetic field. The lower boundary of the spinon excitations splits gradually with increasing magnetic field. The overall feature of the magnetic excitation spectra in the magnetic field is reproduced by the theoretical calculation based on the spin 1/2 XXZ antiferromagnetic chain model, which predicts that the dynamic magnetic structure factor of the spin component along the chain direction is enhanced and that along the field direction has clear incommensurate correlations.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [1] ; ORCiD logo [1] ;  [5] ;  [6] ;  [7] ;  [2] ;  [8] ;  [3]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Japan Atomic Energy Agency, Ibaraki (Japan)
  3. Osaka Univ., Osaka (Japan)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Shanghai Jiao Tong Univ., Shanghai (People's Republic of China)
  5. NIST Center for Neutron Research, Gaithersburg, MD (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  6. NIST Center for Neutron Research, Gaithersburg, MD (United States)
  7. Niigata Univ., Niigata (Japan)
  8. Tohoku Univ., Sendai (Japan)
Publication Date:
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 96; Journal Issue: 2; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
OSTI Identifier:
1376477
Alternate Identifier(s):
OSTI ID: 1372718