Employing a variational approach that takes into account electron-phonon and magnetic interactions in La12xAxMnO3 perovskites with 0,x,0.5, the effects of the magnetic field and the oxygen isotope substitution on the phase diagram, the lattice distortions, and the infrared absorption are studied at x50.3. The lattice displacements show a strong correlation with the conductivity and the magnetic properties of the system. Then the conductivity spectra are characterized by a marked sensitivity to the external parameters near the phase boundary.
Effects of magnetic field and isotopic substitution upon the infrared absorption of manganites / Perroni, CARMINE ANTONIO; Cataudella, Vittorio; De Filippis, G.; Iadonisi, G.; Ramaglia, V.; Ventriglia, Franco. - In: PHYSICAL REVIEW. B, CONDENSED MATTER. - ISSN 0163-1829. - STAMPA. - 66:(2002), pp. 184409-1-184409-7. [10.1103/PhysRevB.66.184409]
Effects of magnetic field and isotopic substitution upon the infrared absorption of manganites
PERRONI, CARMINE ANTONIO;CATAUDELLA, VITTORIO;G. De Filippis;VENTRIGLIA, FRANCO
2002
Abstract
Employing a variational approach that takes into account electron-phonon and magnetic interactions in La12xAxMnO3 perovskites with 0,x,0.5, the effects of the magnetic field and the oxygen isotope substitution on the phase diagram, the lattice distortions, and the infrared absorption are studied at x50.3. The lattice displacements show a strong correlation with the conductivity and the magnetic properties of the system. Then the conductivity spectra are characterized by a marked sensitivity to the external parameters near the phase boundary.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
