TY - JOUR
AU - MUKHERJEE, PRABIR K
PY - 2023/05/08
Y2 - 2024/04/17
TI - MAGNETIC ENTROPY AND MAGNETIC HEAT CAPACITY NEAR THE FIRST-ORDER FERROMAGNETIC TO PARAMAGNETIC PHASE TRANSITION
JF - Quantum Journal of Engineering, Science and Technology
JA - qjoest
VL - 4
IS - 2
SE - Articles
DO -
UR - https://qjoest.com/index.php/qjoest/article/view/108
SP - 37-44
AB - <p>The continuous development of magnetization below the transition point is the characterization of the second order ferromagnetic (FM) phase to paramagnetic (PM) phase transition (FM-PM). The discontinuous change in magnetization along the hysteresis path is the characterization of the first order FM-PM phase transition. The manganites with the highest FM-PM transition temperature undergo a conventional second order phase transition, whereas for the lower FM-PM transition temperature manganites, the FM-PM phase transition is first order. In the presence of an external magnetic field, the first order FM-PM transition shifts towards the higher temperature while the width of thermal hysteresis in magnetization decreases gradually and the transition becomes second-order. The magnetic entropy and magnetic heat capacity near the first-order ferromagnetic to paramagnetic phase transition are discussed using Landau theory. The magnetic entropy and magnetic heat capacity are calculated near the phase transition. The theoretical results are discussed by piloting figures. We show that negative values of the magnetic entropy and positive values of magnetic heat capacity in the ferromagnetic phase increase with the increase of the magnetic field.</p>
ER -