Physical properties of double-doping Lanthanum manganite for bolometer applications

Abstract

We have studied the structural, magnetic, critical behavior and electrical properties of La0.5Ag0.1Ca0.4MnO3 sample synthesized by traditional Solid State route. X-ray diffraction studies reveal that La0.5Ag0.1Ca0.4MnO3 crystallizes in the orthorhombic structure with Pnma space group. Vibrational study by means of infrared spectroscopy each give a part of the vibrational reality of the material explored. Studying the magnetic and electric properties of La0.5Ag0.1Ca0.4MnO3, it has been found the compound exhibits a second-order phase transition around the ferromagnetic-paramagnetic transition. The critical behavior of La0.5Ag0.1Ca0.4MnO3 compound is investigated based on the data of static magnetic measurements in the vicinity of its critical temperature TC. The estimated critical exponents derived from the magnetic data were estimated using modified Arrott plot (MAP) and critical isotherm technique (CI). The critical exponents find are comparable to the values theoretical predicted for the values corresponding to the 3D-Ising model and are confirmed by scaling equations of state. The investigated compound exhibits a semiconductor-metal transition at 380 K. For the important value of TCR at zero magnetic fields, we consider our sample is a good candidate infrared sensor for night vision bolometer applications.