Abstract
La0.67Ca0.33MnO3 (LCMO) has attracted considerable attention due to its superior colossal magnetoresistance properties, as well as the metal-insulator transition and enhanced temperature coefficient of resistance (TCR) characteristics. Here, the co-precipitation method is utilized in order to prepare the LCMO-based ceramics, whose magnetotransport properties as a function of calcination temperature (Tcal) were thoroughly investigated. The TCR of LCMO exhibits initially an increasing pattern and then decreases by elevating the Tcal, whereas the metal-insulator transition temperature (TMI) is shifted towards a lower temperature value. In addition, the magnetoresistance (MR) was enhanced by enforcing a bigger Tcal and reached the value of 82.4% at Tcal = 800 °C. The underlying mechanism for the manifestation of such improved properties is thoroughly examined by employing electrical measurements in various temperature ranges. An optimal TCR of 32.3%·K−1 in LCMO-based ceramic was attained with Tcal = 500 °C, indicating that the co-precipitation method could be employed in order to facilitate the potential use of LCMO for infrared detecting and magnetoresistive switching applications.
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