Effect of oxygen isotope substitution and crystal micro-structure on magnetic ordering and phase separation in {$(\mathrm{L}{\mathrm{a}}_{1-\mathrm{y}}\mathrm{P}{\mathrm{r}}_{\mathrm{y}}{)}_{0.7}\mathrm{C}{\mathrm{a}}_{0.3}\mathrm{Mn}{\mathrm{O}}_3$}

Abstract

The crystal and magnetic structures of the specified CMR manganite system have been studied as a function of $y=(0.2-1)$ across the metal-insulator (MI) transition, and of the oxygen mass (${}^{16}$O, ${}^{18}$O). We quantitatively show how the polaronic narrowing of the carrier bandwidth and the crystal lattice micro-strains control the volume fractions of the mesoscopic ferro- and antiferromagnetic clusters. A well-defined dip in the transition temperatures and the suppression of all the types of long range ordering seen near the MI-transition at $y\simeq 0.9$ indicate a key role of the quenched disorder for the formation of the long-scale phase separated state.

21 pages (REVTeX preprint), 1 Table, 13 Figures, accepted in PRB

References in corpus (4)

• Relevance of Cooperative Lattice Effects and Correlated Disorder in Phase-Separation Theories for CMR Manganites
• Orbital domain state and finite size scaling in ferromagnetic insulating manganites
• Crystal and magnetic structure of La${}_{1-x}$Ca${}_x$MnO${}_3$ compound $(0.11\leq x\leq 0.175
• Structural and magnetic ordering in Pr0.65(CaySr1-y)0.35MnO3: "quantum critical point" versus phase segregation scenarios

Cited by in corpus (3)

• Correlation Between Phase Competition and the Nucleation of a Griffiths Phase in (La1-yPry)0.7Ca0.3Mn16/18O3
• Effect of Sr doping on the magnetic exchange interactions in manganites
• Evidence for strong effect of quenched correlated disorder on phase separation and magnetism in (La_{1-y}Pr_{y})_{0.7}Ca_{0.3}MnO_3