Long-scale phase separation versus homogeneous magnetic state in (La1-yPry)0.7Ca0.3MnO 3: A neutron diffraction study

A. M. Balagurov, V. Yu Pomjakushin, D. V. Sheptyakov, V. L. Aksenov, P. Fischer, L. Keller, O. Yu Gorbenko, A. R. Kaul, N. A. Babushkina

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Abstract

The magnetic structure of the series (La1-yPry)0.7Ca0.3MnO3 for y from 0.5 to 1.0 has been studied by neutron powder diffraction in the temperature range from 10 to 293 K and in external magnetic fields up to 4 T. The phase diagram has a border region of concentrations 0.6≤y≤0.8 separating the homogeneous ferromagnetic (FM) metallic and canted antiferromagnetic (AFM) insulating states. In this region the low-temperature magnetic state is macroscopically (> 103 Å) separated into AFM and FM phases. The FM phase has a small noncollinearity, presumably due to interfaces to the AFM phase. The macroscopical clusters can be induced by disorder on the carrier's hopping amplitude caused by natural dispersion of the A cation radius near the metal-insulator transition around y=0.7. For the concentrations y≥0.9 the long-range ordered magnetic state is homogeneous with a canted AFM structure. The total long-range ordered magnetic moment of the Mn ion shows a steplike decrease from μMn=3.4μB to 2.5μB as a function of Pr concentration at the transition to a homogeneous canted antiferromagnetic (CAF) state. The spatial inhomogeneities can still be present for y ≥0.9, according to the reduced μMn value, but the Mn spins between the homogeneously CAF-ordered moments have to be either short-range ordered or paramagnetic. In addition, a ferromagnetic contribution of the Pr moments parallel to the ferromagnetic component of Mn moments is found for y>0.6. The moment of Pr scales with the ferromagnetic Mn moment rather than with the Pr concentration and thus presumably induced by Mn.

Original languageEnglish
Article number024420
Pages (from-to)244201-2442010
Number of pages2197810
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume64
Issue number2
Publication statusPublished - 2001

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Balagurov, A. M., Pomjakushin, V. Y., Sheptyakov, D. V., Aksenov, V. L., Fischer, P., Keller, L., Gorbenko, O. Y., Kaul, A. R., & Babushkina, N. A. (2001). Long-scale phase separation versus homogeneous magnetic state in (La1-yPry)0.7Ca0.3MnO 3: A neutron diffraction study. Physical Review B - Condensed Matter and Materials Physics, 64(2), 244201-2442010. [024420].