We have systematically studied the transport properties of colossal magnetoresistance (CMR) manganite films at temperatures of up to 550 K by changing parameters influencing the amount of disorder in the system. Independent of the type and amount of disorder, the resistivity can always be described using a Tα-power law in the ferromagnetic-metallic phase and a thermally activated behavior in the polaronic-insulating phase. A linear correlation between both the value of the α coefficient and the polaron formation energies Eg as a function of the metal-insulator transition temperature TMI has been found. Our results indicate the possibility of describing the transport properties in CMR manganites in terms of a single disorder parameter.
Influence of a single disorder parameter on the conduction mechanisms in manganite thin films
Barone C.Writing – Original Draft Preparation
;Galdi A.Formal Analysis
;Maritato L.Writing – Review & Editing
2007
Abstract
We have systematically studied the transport properties of colossal magnetoresistance (CMR) manganite films at temperatures of up to 550 K by changing parameters influencing the amount of disorder in the system. Independent of the type and amount of disorder, the resistivity can always be described using a Tα-power law in the ferromagnetic-metallic phase and a thermally activated behavior in the polaronic-insulating phase. A linear correlation between both the value of the α coefficient and the polaron formation energies Eg as a function of the metal-insulator transition temperature TMI has been found. Our results indicate the possibility of describing the transport properties in CMR manganites in terms of a single disorder parameter.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
