Imaging the competition between charge-ordered and charge-delocalised states in Pr0.65(CaySr1鈭抷)0.35MnO3
Acta Crystallographica Section A: Foundations and advances International Union of Crystallography (IUCr) 58:s1 (2002) c144-c144
ChemInform Abstract: Formation of Isomorphic Ir3+ and Ir4+ Octamers and Spin Dimerization in the Spinel CuIr2S4.
ChemInform Wiley 33:25 (2002) no-no
Structural and magnetic ordering in Pr0.65(CaySr1-y)0.35MnO3: "quantum critical point" versus phase segregation scenarios
(2002)
Structural and magnetic ordering in Pr0.65(CaySr1-y)0.35MnO3: "quantum critical point" versus phase segregation scenarios
ArXiv cond-mat/0206082 (2002)
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.Large Anisotropic Thermal Expansion Anomaly near the Superconducting Transition Temperature in MgB2
(2002)