Spin excitations used to probe the nature of exchange coupling in the magnetically ordered ground state of Pr0.5Ca0.5MnO3

Ewings, R. A.; Perring, T. G.; Sikora, O.; Abernathy, D. L.; Tomioka, Y.; Tokura, Y.

doi:10.1103/PhysRevB.94.014405

Title: Spin excitations used to probe the nature of exchange coupling in the magnetically ordered ground state of $\Pr_{0.5} {Ca}_{0.5} {MnO}_{3}$

Journal Article · Wed Jul 06 00:00:00 EDT 2016 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.94.014405· OSTI ID:1295094

Ewings, R. A. ^[1]; Perring, T. G. ^[2]; Sikora, O. ^[3]; Abernathy, D. L. ^[4]; Tomioka, Y. ^[5]; Tokura, Y. ^[6]

Science and Technology Facilities Council (STFC), Oxford (United Kingdom). Rutherford Appleton Lab., ISIS Neutron Source
Science and Technology Facilities Council (STFC), Oxford (United Kingdom). Rutherford Appleton Lab., ISIS Neutron Source; London Centre for Nanotechnology, London (United Kingdom)
Univ. of Bristol, Bristol (United Kingdom). H. H. Wills Physics Lab.
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division
National Inst. of Advanced Industrial Science and Technology (AIST), Tsukuba (Japan). Electronics and Photonics Research Inst.
Univ. of Tokyo (Japan). Dept. of Applied Physics

We have used time-of-flight inelastic neutron scattering to measure the spin wave spectrum of the canonical half-doped manganite Pr_0.5Ca_0.5MnO₃ in its magnetic and orbitally ordered phase. Comparison of the data, which cover multiple Brillouin zones and the entire energy range of the excitations, with several different models shows that only the CE-type ordered state provides an adequate description of the magnetic ground state, provided interactions beyond nearest neighbor are included. We are able to rule out a ground state in which there exist pairs of dimerized spins which interact only with their nearest neighbors. The Zener polaron ground state, which comprises strongly bound magnetic dimers, can be ruled out on the basis of gross features of the observed spin wave spectrum. A model with weaker dimerization reproduces the observed dispersion but can be ruled out on the basis of subtle discrepancies between the calculated and observed structure factors at certain positions in reciprocal space. Adding further neighbor interactions results in almost no dimerization, i.e. interpolating back to the CE model. These results are consistent with theoretical analysis of the degenerate double exchange model for half-doping.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); Engineering and Physical Sciences Research Council (EPSRC); Polish National Science Center (NCN)

Grant/Contract Number:: AC05-00OR22725; 2012/04/A/ST3/00331; EP/G0314060/1

OSTI ID:: 1295094

Alternate ID(s):: OSTI ID: 1260441

Journal Information:: Physical Review B, Vol. 94, Issue 1; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 8 works

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Title: Spin excitations used to probe the nature of exchange coupling in the magnetically ordered ground state of $\Pr_{0.5} {Ca}_{0.5} {MnO}_{3}$