Phenomenological model for colossal magnetoresistance in optimally doped manganese perovskites

Multilevel Resistance Switching Memory in La2/3Ba1/3MnO3/0.7Pb(Mg1/3Nb2/3)O3-0.3PbTiO3 (011) Heterostructure by Combined Straintronics-Spintronics

“…It is reported that the magnetoresistance effect observed in Manganite films is closely related with the phase separation phenomenon, i.e., the coexistence of the ferromagnetic metallic phase and paramagnetic insulating phase. 41 The magnetic field would alter the subtle balance between these two electronic phases, resulting in a maximum magnetoresistance value near the Curie temperature due to the strong competition. Figure 5a shows the magnetic field dependence of resistance for an LBMO film under two remnant strain states of the PMN−PT substrate at a temperature of 300 K. It is clear that the resistance of the LBMO film at remnant strain states A and D are distinctly apart from each other, and both are suppressed with increasing magnetic field.…”

“…Aside from the response to an electric field, the LBMO film resistance can be readily modulated by a magnetic field due to the strong interplay between spin and charge degrees of freedom. It is reported that the magnetoresistance effect observed in Manganite films is closely related with the phase separation phenomenon, i.e., the coexistence of the ferromagnetic metallic phase and paramagnetic insulating phase . The magnetic field would alter the subtle balance between these two electronic phases, resulting in a maximum magnetoresistance value near the Curie temperature due to the strong competition.…”

Effects of ferroelectric-poling-induced strain on magnetic and transport properties of La0.67Ba0.33MnO3 thin films grown on (111)-oriented ferroelectric substrates

“…Specifically, competition between the FMM and PMI phases is strongest at T C . [20][21][22] The magnetic field modifies the subtle balance between these two phases by converting a considerable amount of f PMI to f FMM . Here, the quantity k T [k T ¼ f FMM ðTÞ=f PMI ðTÞ] is defined to qualitatively characterize the magnitude of phase separation.…”

Electrical properties and enhanced room temperature magnetoresistance in (La0.7Ca0.2Sr0.1MnO3)1−x/Pdx composites

“…Unfortunately, all of the above models cannot explain the prominent change of the -T curves near T p . But if according to a new phenomenology model based on the phase segregation mechanism proposed by Yuan et al [28], we can solve this problem completely. In this model, the total resistivity is a sum of contributions from PM and FM regions, and at any temperature is determined by a change of the volume fractions of the both regions.…”