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Crystal electric field in the R2Ti2O7 pyrochlore compounds.

A Bertin1, Y Chapuis, P Dalmas de Réotier

  • 1Institut Nanosciences et Cryogénie, SPSMS, CEA and Université Joseph Fourier, F-38054 Grenoble, France. alexandre.bertin@cea.fr

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|May 29, 2012
PubMed
Summary
This summary is machine-generated.

A scaling law provides crystal-field parameters for rare-earth ions in R(2)Ti(2)O(7) pyrochlores. This accurately describes neutron scattering data and yields spectroscopic g factors and wavefunctions.

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Area of Science:

  • Solid State Chemistry
  • Materials Science
  • Condensed Matter Physics

Background:

  • Rare-earth ions in R(2)Ti(2)O(7) pyrochlore materials exhibit complex crystal-field excitations.
  • Neutron scattering has previously identified these excitations, but a unified parameter set was lacking.

Purpose of the Study:

  • To establish a unique set of crystal-field parameters for rare-earth ions within the R(2)Ti(2)O(7) pyrochlore series.
  • To accurately describe observed crystal-field excitations using a simple scaling law.

Main Methods:

  • Application of a simple scaling law to determine crystal-field parameters.
  • Analysis of neutron scattering data for crystal-field excitations.
  • Calculation of spectroscopic g factors and ground-state wavefunctions.

Main Results:

  • A unique set of crystal-field parameters was identified for the R(2)Ti(2)O(7) pyrochlore series.
  • The parameters successfully describe previously observed crystal-field excitations.
  • Spectroscopic g factors and ground-state wavefunctions were determined for various rare-earth ions.

Conclusions:

  • The proposed scaling law offers a robust method for parameterizing crystal-field interactions in these materials.
  • This work provides essential data for understanding the magnetic and spectroscopic properties of rare-earth pyrochlores.