Interrelationship between Li+ diffusion, charge, and magnetism in Li7Mn2O4 and Li71.1Mn1.9O 4 spinels: Elastic, inelastic, and quasielastic neutron scattering

Kazuya Kamazawa, Hiroshi Nozaki, Masashi Harada, Kazuhiko Mukai, Yutaka Ikedo, Kazuki Iida, Taku J. Sato, Yiming Qiu, Madhusudan Tyagi, Jun Sugiyama

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14 Citations (Scopus)

Abstract

Using quasielastic neutron scattering (QENS), we have investigated a self-diffusive behavior of Li+ ions for both Li7Mn2O 4 and Li71.1Mn1.9O4 spinels. In addition, we have carried out elastic and inelastic neutron scattering measurements using the same samples, to study the interrelationship between Li+ self-diffusion, magnetism, and charge distribution in the lattice. From the QENS results, the self-diffusion of Li+ was observable above 280 K, and a self-diffusion coefficient (DsLi) for Li7Mn 2O4 was estimated as ~10-8 cm2/s at 400 K. DsLi for Li71.1Mn1.9O4 was comparable to that for Li7Mn2O4. Furthermore, combining with the results of elastic and inelastic measurements, it was found that Li71.1Mn 1.9O4 undergoes a transition from a low-temperature (T) short-range charge-ordered (SRCO) phase to a high-T charge-disordered (CDO) phase at 280 K. The structure of the SRCO was determined as a hexagon, because the formation of hexagon spin clusters was deduced from a magnetic diffuse scattering at low T. Assuming the presence of the SRCO-CDO transition at 280 K, both the anomaly of the diffusive behavior at 280 K and the local lattice distortion below 280 K are reasonably explained, despite the absence of long-range CO for Li71.1Mn1.9O4.

Original languageEnglish
Article number094401
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume83
Issue number9
DOIs
Publication statusPublished - 2011 Mar 1
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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