The effective magnetic moments of Co2+ and Co3+ in SrTiO3 investigated by temperature-dependent magnetic susceptibility

Yuzki M. Oey, Robert Cava

Research output: Contribution to journalArticle

Abstract

The magnetic behavior of Co2+ and Co3+ ions doped into a well-known perovskite, SrTiO3, is investigated. We report the change in the effective magnetic moment of the cobalt ions, based on temperature-dependent magnetic susceptibility measurements, as a function of their formal valence. A low Co content (4%) is chosen to minimize the effects of Co-Co interactions and the co-dopant Nb5+ is employed to control the Co valence. The materials have formulas SrTi0.96- xCo0.04NbxO3, with x between x = 0.04 (Co3+) and x = 0.08 (Co2+). Both standard Curie-Weiss analysis and Kotani-type analysis reach the same conclusions: neither Co2+ nor Co3+ is in a low moment magnetic state when doped into SrTiO3, and no temperature-induced spin state transitions are observed.

Original languageEnglish (US)
Article number110667
JournalMaterials Research Bulletin
Volume122
DOIs
StatePublished - Feb 2020

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Keywords

  • Cobalt spin state transition
  • Perovskite
  • Strontium titanate
  • Temperature-dependent magnetic susceptibility

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