Asymmetric phase diagram and phase separation in Pr<inf>0.5-δ</inf>Ca<inf>0.2+δ</inf>Sr<inf>0.3</inf>MnO<inf>3</inf> (-0.04≤δ≤0.04)

Abstract:

We present electric and magnetic properties of polycrystalline Pr0.5-δCa0.2+δSr0.3MnO3, for δ between -0.04 and 0.04, where the hole concentration is n=0.5+δ. In this series, we study the effects of moving n away from 0.5 on both, the phase diagram and phase separated state. We found that the low temperature ferromagnetic fraction XFM continuously decreases when n increases. As a result, the samples with n<0.5 (large XFM) exhibit metallic resistivity at low T while for n>0.5 the insulating state predominates. We construct a detailed T-n phase diagram showing the asymmetries around half-doping. © 2002 Elsevier Science B.V. All rights reserved.

Año de publicación:

2002

Keywords:

• Charge ordering
• Magnetic ordering
• phase separation

Fuente:

scopus