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  Magnetic dimers and trimers in the disordered S=3/2 spin system BaTi1/2Mn1/2O3

Garcia, F. A., Kaneko, U. F., Granado, E., Sichelschmidt, J., Hölzel, M., Duque, J. G. S., et al. (2015). Magnetic dimers and trimers in the disordered S=3/2 spin system BaTi1/2Mn1/2O3. Physical Review B, 91: 224416, pp. 1-8. doi:10.1103/PhysRevB.91.224416.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0027-A8CE-F Version Permalink: http://hdl.handle.net/21.11116/0000-0001-1761-8
Genre: Journal Article

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 Creators:
Garcia, F. A.1, Author
Kaneko, U. F.1, Author
Granado, E.1, Author
Sichelschmidt, J.2, Author              
Hölzel, M.1, Author
Duque, J. G. S.1, Author
Nunes, C. A. J.1, Author
Amaral, R. P.1, Author
Marques-Ferreira, P.1, Author
Lora-Serrano, R.1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Jörg Sichelschmidt, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863468              

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 Abstract: We report a structural-magnetic investigation by x-ray absorption spectroscopy (XAS), neutron diffraction, dc susceptibility (χdc), and electron spin resonance (ESR) of the 12R-type perovskite BaTi1/2Mn1/2O3. Our structural analysis by neutron diffraction supports the existence of structural trimers with chemically disordered occupancy of Mn4+ and Ti4+ ions, with the valence of the Mn ions confirmed by the XAS measurements. The magnetic properties are explored by combining dc-susceptibility and X-band (9.4 GHz) electron spin resonance, both in the temperature interval of 2≤T≤1000 K. A scenario is presented under which the magnetism is explained by considering magnetic dimers and trimers, with exchange constants Ja/kB=200(2) K and Jb/kB=130(10) K, and orphan spins. Thus, BaTi1/2Mn1/2O3 is proposed as a rare case of an intrinsically disordered S=32 spin gap system with a frustrated ground state.

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Language(s): eng - English
 Dates: 2015-06-112015-06-11
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Method: -
 Identifiers: DOI: 10.1103/PhysRevB.91.224416
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Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 91 Sequence Number: 224416 Start / End Page: 1 - 8 Identifier: ISSN: 1098-0121
CoNE: /journals/resource/954925225008