Cooperative dynamics in doped manganite films: Phonon anomalies in the ferromagnetic state

@article{Hartinger2004CooperativeDI,
  title={Cooperative dynamics in doped manganite films: Phonon anomalies in the ferromagnetic state},
  author={Ch. Hartinger and Franz Mayr and Alois Loidl and Thilo Kopp},
  journal={Physical Review B},
  year={2004},
  volume={70},
  pages={134415}
}
We present optical measurements of phononic excitations in La$_{2/3}$Ca$_{1/3}$MnO$_{3}$ (LCMO) and La$_{2/3}$Sr$_{1/3}$MnO$_{3}$ (LSMO) thin films covering the full temperature range from the metallic ferromagnetic to the insulating paramagnetic phase. All eight phonons expected for the R$\bar{3}$c symmetry in LSMO and 17 out of the expected 25 phonons for the Pnma symmetry in LCMO have been determined. Close to the ferromagnetic-to-paramagnetic transition both compounds reveal an anomalous… 
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References

SHOWING 1-10 OF 41 REFERENCES
OPTICAL CONDUCTIVITY OF COLOSSAL-MAGNETORESISTANCE COMPOUNDS : ROLE OF ORBITAL DEGENERACY IN THE FERROMAGNETIC PHASE
Recent optical conductivity $\sigma(\omega)$ experiments have revealed an anomalous spectral distribution in the ferromagnetic phase of the perovskite system $La_{1-x}Sr_xMnO_3$. Using finite
Orbital liquid in perovskite transition-metal oxides
We study the effects of the degeneracy of the ${e}_{g}$ orbitals in perovskite transition-metal oxides in the limit of strong repulsive electron-electron interaction. The isospin field is introduced
Physical origin of the buckling in CuO2: Electron-phonon coupling and Raman spectra
It is shown theoretically that the buckling of the ${\mathrm{CuO}}_{2}$ planes in certain cuprate systems can be explained in terms of an electric field across the planes which originates from
Lattice effects on the magnetoresistance in doped LaMnO3.
TLDR
The results show that the notion of ``double exchange'' must be generalized to include changes in the Mn-Mn electronic hopping parameter as a result of changes inThe Mn-O-Mm bond angle.
Magnetism and structural distortion in the La0.7Sr0.3MnO3 metallic ferromagnet.
TLDR
The superlattice reflection intensities are independent of temperature demonstrating that there is no primary lattice distortion anomaly at the magnetic transition temperature {ital T}{sub {ital C}}=378.1 K; however, there is a lattice contraction.
Spectroscopic studies of small to large polaron crossover in the perovskite manganese oxides
We present an optical reflectance and Raman-scattering study of the ${A}_{1\ensuremath{-}x}{A}_{x}^{\ensuremath{'}}{\mathrm{MnO}}_{3}$ system as a function of temperature and doping $(0.2l~xl~0.5).$
Effect of structural and magnetic transitions in La 1 − x M x MnO 3 ( M = Sr , Ca) single crystals in Raman scattering
Polarized Raman spectra of undoped and doped ${\mathrm{La}}_{1\ensuremath{-}x}{M}_{x}{\mathrm{MnO}}_{3}$ single crystals have been studied in the temperature range from 5 to 423 K ($M=\mathrm{Sr},$
Insulator-metal transition and giant magnetoresistance in La1-xSrxMnO3.
TLDR
Insulator-metal phenomena depending on band filling, temperature, and external magnetic field have been investigated for prototypical double-exchange ferromagnets, namely, crystals of crystals of La 1-x, showing large negative magnetoresistance around the ferromagnetic transition temperature.
Spontaneous behavior and magnetic field and pressure effects on La2/3Ca1/3MnO3 perovskite.
The effects of magnetic field and pressure on the unusual spontaneous behavior of ${\mathrm{La}}_{2/3}$${\mathrm{Ca}}_{1/3}$${\mathrm{MnO}}_{3}$ have been thoroughly investigated. Resistivity and
Effects of phonon hardening on the polaron transport in colossal magnetoresistive manganites
It is well established that transport properties of colossal magnetoresistive manganites can be qualitatively explained by the small polaron model incorporating the double-exchange interaction. We
...
1
2
3
4
5
...