Divergent effects of static disorder and hole doping in geometrically frustrated β-CaCr2O4

S. E. Dutton, C. L. Broholm, R. J. Cava

Research output: Contribution to journalArticle

10 Scopus citations

Abstract

The gallium substituted and calcium deficient variants of geometrically frustrated β-CaCr2O4, β-CaCr 22xGa2xO4 (0.02≤x≤0.25) and β-Ca1-yCr2O4 (0.075≤y≤0.15), have been investigated by X-ray powder diffraction, magnetization and specific heat measurements. This allows for a direct comparison of the effects, in a geometrically frustrated magnet, of the static disorder that arises from non-magnetic substitution and the dynamic disorder that arises from hole doping. In both cases, disturbing the Cr3 lattice results in a reduction in the degree of magnetic frustration. On substitution of Ga, which introduces disorder without creating holes, a gradual release of spins from ordered antiferromagnetic states is observed. In contrast, in the calcium-deficient compounds the introduction of holes induces static ferrimagnetic ordering and much stronger perturbations of the β-CaCr2O4 host.

Original languageEnglish (US)
Pages (from-to)1798-1804
Number of pages7
JournalJournal of Solid State Chemistry
Volume183
Issue number8
DOIs
StatePublished - Aug 1 2010

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

Keywords

  • Chromates
  • Geometric frustration
  • Hole doping
  • Magnetic susceptibility
  • Oxide materials

Fingerprint Dive into the research topics of 'Divergent effects of static disorder and hole doping in geometrically frustrated β-CaCr<sub>2</sub>O<sub>4</sub>'. Together they form a unique fingerprint.

  • Cite this