Structural and magnetic ordering in Pr0.65(CaySr1-y)0.35MnO3: Quantum critical point versus phase segregation scenarios

G.R. Blake, L. Chapon, P.G. Radaelli, D.N. Argyriou, M.J. Gutmann, J.F. Mitchell

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Abstract

The phase diagram of Pr0.65(CaySr1–y)0.35MnO3, 0.6≤y≤0.8, has been determined by neutron diffraction, magnetization, and electrical conductivity measurements in order to investigate the nature of the transition between ferromagnetic metallic and charge-ordered insulating states near y = 0.75. Two possible scenarios for this transition have been proposed: a "quantum-critical-point"-like feature, near which an associated charge-disordered paramagnetic phase is present, or a phase coexistence region. We demonstrate that the latter case is true, phase segregation occurring on a mesoscopic macroscopic length scale (several hundred angstroms to several microns). Our results show that no significant amount of the charge-disordered paramagnetic phase is present at low temperatures. Our data also indicate that the charge-ordered insulator to ferromagnetic metal phase boundary is temperature as well as composition dependent.
Original languageEnglish
Pages (from-to)144412-1-144412-9
JournalPhysical Review B
Volume66
Issue number14
DOIs
Publication statusPublished - 2002

Keywords

  • neutron diffraction
  • electrical conductivity
  • magnetisation
  • ferromagnetic materials
  • metal-insulator transition
  • magnetic transitions
  • strontium compounds
  • calcium compounds
  • praseodymium compounds

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