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Title: Magnetic excitations of the Cu 2 + quantum spin chain in Sr 3 CuPtO 6

Here, we report the magnetic excitation spectrum as measured by inelastic neutron scattering for a polycrystalline sample of Sr 3CuPtO 6. Modeling the data by the 2+4 spinon contributions to the dynamical susceptibility within the chains, and with interchain coupling treated in the random phase approximation, accounts for the major features of the powder-averaged structure factor. The magnetic excitations broaden considerably as temperature is raised, persisting up to above 100 K and displaying a broad transition as previously seen in the susceptibility data. No spin gap is observed in the dispersive spin excitations at low momentum transfer, which is consistent with the gapless spinon continuum expected from the coordinate Bethe ansatz. However, the temperature dependence of the excitation spectrum gives evidence of some very weak interchain coupling.
Authors:
 [1] ;  [1] ; ORCiD logo [2] ; ORCiD logo [2] ;  [3] ;  [4] ;  [4] ;  [5] ;  [6] ;  [6] ;  [7] ;  [7] ;  [1]
  1. Inst. of Basic Science (IBS), Seoul (Korea, Republic of). Center for Correlated Electron System (CCES); Seoul National Univ. (Korea, Republic of). Dept. of Physics and Astronomy
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Scattering Division
  3. Science and Technology Facilities Council (STFC), Oxford (United Kingdom). Rutherford Appleton Lab., ISIS Neutron Source
  4. Univ. of Queensland, Brisbane (Australia). School of Mathematics and Physics
  5. Georgia Inst. of Technology, Atlanta, GA (United States). School of Physics
  6. North Carolina State Univ., Raleigh, NC (United States). Dept. of Chemistry
  7. Rutgers Univ., Piscataway, NJ (United States). Rutgers Center for Emergent Materials and Dept. of Physics and Astronomy
Publication Date:
Grant/Contract Number:
AC05-00OR22725; FG02-07ER46382; FT130100161; DP160100060
Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 97; Journal Issue: 10; 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 Office of Science (SC), Basic Energy Sciences (BES) (SC-22); Inst. of Basic Science (IBS), Seoul (Korea, Republic of). Center for Correlated Electron System (CCES); Rutgers Univ., Piscataway, NJ (United States); Australian Research Council (ARC); Univ. of Queensland, Brisbane (Australia)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE; antiferromagnetism; frustrated magnetism; magnetic susceptibility; spinon; 1-dimensional spin chains; polycrystalline materials; inelastic neutron scattering; time of flight neutron spectroscopy
OSTI Identifier:
1437891
Alternate Identifier(s):
OSTI ID: 1430562