Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2002-06-06
Physics
Condensed Matter
Strongly Correlated Electrons
Submitted to Phys. Rev. B
Scientific paper
10.1103/PhysRevB.66.144412
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.
Argyriou Dimitri N.
Blake G. R.
Chapon L.
Gutmann Matthias J.
Mitchell John F.
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