Valence instability of cerium under pressure in the Kondo-like perovskite La0.1 Ce0.4 Sr0.5 Mn O3

T. Eto, A. Sundaresan, F. Honda, G. Oomi

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3 Citations (Scopus)

Abstract

The effects of hydrostatic pressure and magnetic field on the electrical resistance of the Kondo-like perovskite manganese oxide, La0.1 Ce0.4 Sr0.5 Mn O3 with a ferrimagnetic ground state, have been investigated up to 2.1 GPa and 9 T. In this compound, the Mn moments undergo a double exchange mediated ferromagnetic ordering at TC ∼280 K and there is a resistance maximum, Tmax at about 130 K, which is correlated with an antiferromagnetic ordering of cerium with respect to the Mn-sublattice moments. Under pressure, the Tmax shifts to lower temperatures at a rate of d Tmax dP=-162 K GPa and disappears at a critical pressure Pc ∼0.9 GPa. Further, the coefficient, m of -ln T term due to Kondo scattering decreases linearly with increase of pressure showing an inflection point in the vicinity of Pc. These results suggest that cerium undergoes a transition from Ce3+ state to a Ce4+ Ce3+ mixed valence state under pressure. In contrast to the pressure effect, the applied magnetic field shifts Tmax to higher temperatures, presumably due to enhanced ferromagnetic Mn moments.

Original languageEnglish
Article number060402
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume72
Issue number6
DOIs
Publication statusPublished - Aug 1 2005
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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