Abstract
The effect of electronic phase segregation in a broad metal-Insulator transition (MIT) observed in La0.75Ca0.25-xSrxMnO3 (x=0.1) composition is investigated using heat capacity, magnetization, electrical resistivity and magnetoresistance measurements. The negative magnetoresistance of 65% in an applied magnetic field of 12T and 15% in 1T with a broad working range of 18K around 300K which is beneficial for room temperature colossal magnetoresistance (CMR) applications. The broad transition in temperature dependent zero field resistivity measurement is analyzed in the light of percolation model indicates the abundance of insulating/metallic clusters in metallic/insulating region. A significant difference between the metallic fraction around the MIT and the ferromagnetic phases observed around the Curie temperature demonstrates the interplay between volume of itinerant and polaronic electronic phases.
Highlights
Manganese perovskites are extensively investigated for the past few decades for their colossal magnetoresistance (CMR) property exhibited in a sprawling range of metal to insulator transition temperatures (TP) with a concomitant magnetic phase transition indicated by Curie temperature (TC) The colossal magnetoresistance (CMR) observed in manganites around the Curie temperature TC are attributed to the interplay between spin, lattice, charge and orbital degrees of freedom.[1].CMR property shows a strong dependence on the nature and order of magnetic/electronic phase transitions and it is reported to be controlled by the electronic phase segregation of the system and its relative volume change at TP [2]
The temperature dependent magnetization in Zerofield cooled (ZFC) and Field cooled (FC) conditions for the sample LCSM1250 and LCSM1400 in an applied magnetic field of 0.01T is shown in figure 1
A prominent splitting between the ZFC and FC behavior is observed in LCSM1400 upto a Curie temperature of 276K after which it merges into a single curve
Summary
Manganese perovskites are extensively investigated for the past few decades for their colossal magnetoresistance (CMR) property exhibited in a sprawling range of metal to insulator transition temperatures (TP) with a concomitant magnetic phase transition indicated by Curie temperature (TC) The colossal magnetoresistance (CMR) observed in manganites around the Curie temperature TC are attributed to the interplay between spin, lattice, charge and orbital degrees of freedom.[1].CMR property shows a strong dependence on the nature and order of magnetic/electronic phase transitions and it is reported to be controlled by the electronic phase segregation of the system and its relative volume change at TP [2]. The effect of electronic phase segregation in a broad metal-Insulator transition (MIT) observed in La0.75Ca0.25-xSrxMnO3 (x=0.1) composition is investigated using heat capacity, magnetization, electrical resistivity and magnetoresistance measurements. The negative magnetoresistance of 65% in an applied magnetic field of 12T and 15% in 1T with a broad working range of 18K around 300K which is beneficial for room temperature colossal magnetoresistance (CMR) applications.
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