Magnetic excitations of the ${\mathrm{Cu}}^{2+}$ quantum spin chain in ${\mathrm{Sr}}_3{\mathrm{CuPtO}}_6$

Journal Article · 29 March 2018 · Physical Review B

DOI: https://doi.org/10.1103/PhysRevB.97.104426 · OSTI ID:1437891

Leiner, J. C. ^[1]; Oh, Joosung ^[1]; Kolesnikov, A. I.  ^[2]; Stone, M. B.  ^[2]; Le, Manh Duc ^[3]; Kenny, E. P. ^[4]; Powell, B. J. ^[4]; Mourigal, M. ^[5]; Gordon, E. E. ^[6]; Whangbo, M. -H. ^[6]; Kim, J. -W. ^[7]; Cheong, S. -W. ^[7]; Park, Je-Geun ^[1]

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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

Here, we report the magnetic excitation spectrum as measured by inelastic neutron scattering for a polycrystalline sample of Sr₃CuPtO₆. 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.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: Australian Research Council (ARC); Inst. of Basic Science (IBS), Seoul (Korea, Republic of). Center for Correlated Electron System (CCES); Rutgers Univ., Piscataway, NJ (United States); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); Univ. of Queensland, Brisbane (Australia)
• Grant/Contract Number: AC05-00OR22725; FG02-07ER46382
• OSTI ID: 1437891
• Journal Information: Physical Review B, Journal Name: Physical Review B Journal Issue: 10 Vol. 97; ISSN 2469-9950; ISSN PRBMDO
• Publisher: American Physical Society (APS)Copyright Statement
• Country of Publication: United States
• Language: English