Probing the Magnetic Interaction with Y-Doping in La0.7Ca0.3MnO3 Compounds by Critical Analysis
The ground state magnetism and nature of the critical exponents in the neighbourhood of phase transition temperature zones of (La1-xYx)0.7Ca0.3MnO3 (x = 0.3, 0.4, 0.5) compounds were studied in this chapter. In addition to a spin-blocking transition, the compound experiences a continuous paramagnetic (PM) to ferromagnetic (FM) transition. The magnetic characteristics of the compounds are greatly influenced by the doping of Y-ions on the La-sites. The crucial fluctuations were studied using different established approaches such as the modified Arrott plot and detailed isothermal magnetization measurements around the magnetic phase transition zones. Widom scaling relation, Kouvel-Fisher technique, and critical isotherm analysis The estimated critical exponents’ dependability and self-consistency are confirmed by the magnetic equation of state. The discovered critical exponent values are consistent with mean-field theory, implying that the examined (La1-xYx)0.7Ca0.3MnO3 (x= 0.3 and 0.4) compounds have a long-range ordered ferromagnetic exchange interaction. However, when the doping concentration (x = 0.5) increases, the magnetic ground state changes, which may be described using the quenched disorder framework.
Saha Institute of Nuclear Physics, HBNI, 1/AF, Bidhannagar, Kolkata-700064, India and Department of Physics, Indian Institute of Technology Kanpur, Kanpur, Uttar Pradesh-208016, India.
Saha Institute of Nuclear Physics, HBNI, 1/AF, Bidhannagar, Kolkata-700064, India and CNSE, SUNY Research Foundation, Albany, New York-12203, USA.
Saha Institute of Nuclear Physics, HBNI, 1/AF, Bidhannagar, Kolkata-700064, India.
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