Signature of Magnetic Phase Separation in the Ground State of Pr1-xCaxMnO3
arXiv:0804.0821 · doi:10.1103/PhysRevB.78.052410
Abstract
Neutron scattering has been used to investigate the evolution of the long- and short-range charge-ordered (CO), ferromagnetic (FM), and antiferromagnetic (AF) correlations in single crystals of Pr1-xCaxMnO3. The existence and population of spin clusters as refected by short-range correlations are found to drastically depend on the doping (x) and temperature (T). Concentrated spin clusters coexist with long-range canted AF order in a wide temperature range in x = 0.3 while clusters do not appear in x = 0.4 crystal. In contrast, both CO and AF order parameters in the x = 0.35 crystal show a precipitous decrease below ~ 35 K where spin clusters form. These results provide direct evidence of magnetic phase separation and indicate that there is a critical doping x_c (close to x = 0.35) that divides the phase-separated site-centered from the homogeneous bond-centered or charge-disproportionated CO ground state.
arXiv comment4 pages, 4 figures, submitted to Phys. Rev. Letters
References in corpus (10)
- Complexity in Strongly Correlated Electronic Systems
- Charge and orbital order in half-doped manganites
- Mesoscopic and Microscopic Phase Segregation in Manganese Perovskites
- X-ray Resonant Scattering Studies of Orbital and Charge Ordering in PrCaMnO
- Resonant x-ray diffraction study of the magnetoresistant perovskite Pr0.6Ca0.4MnO3
- Oxygen-stripes in La0.5Ca0.5MnO3 from ab initio calculations
- Anomalous ferromagnetic spin fluctuations in an antiferromagnetic insulator Pr_{1-x}Ca_{x}MnO_{3}
- Ferromagnetic Polarons in La0.5Ca0.5MnO3 and La0.33Ca0.67MnO3
- Charge modulations vs. strain waves in resonant x-ray scattering
- Electronically smectic-like phase in a nearly half-doped manganite