Details

Autor(en) / Beteiligte

• Lisboa-Filho, P.N.
• Baring, L.A.
• Walmsley, L.
• Bahout, M.
• Barahona, P.
• Peña, O.
• Moure, C.

Titel

Metal–Insulator Transitions and Magnetic Ordered States in Oxygen–Depleted Manganites

Ist Teil von

• Physica. B, Condensed matter, 2006-05, Vol.378, p.522-524

Ort / Verlag

Amsterdam: Elsevier B.V

Erscheinungsjahr

2006

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The use of AC/DC magnetic susceptibility and impedance measurements to detect oxygen depletion effects in La 0.7Ca 0.3MnO 3±δ and NiMn 2O 4±δ spinel-type compounds is reported. For the NiMn 2O 4, for which no Mn 4+ was found, three superposed Debye relaxations were observed in the range 260–180 K. Otherwise, in La 0.7Ca 0.3MnO 3, the argon annealed has contributed to a decrease in T C, but the amount of Mn 4+ is still too high to allow the observation of a relaxation in this frequency window.