  We have investigated the change in entropy with direct measurements of heat
flow as a function of magnetic field at fixed temperatures across the entire
phase diagram of the phase-separated (PS) compound
La$_{0.25}$Pr$_{0.375}$Ca$_{0.375}$MnO$_3$ (LPCMO). At this composition, the
compound shows competing charge-ordered/antiferromagnetic (CO/AF) ground
states. At a fixed temperature, we observe an increase in hysteresis in the
entropy as a function of the applied field. The heat flux shows progressively
irreversible hysteresis, which characterizes the energy barriers between the
two competing ground states, as the temperature is lowered. The increase in the
heat loss correlates with the increase in magnetic viscosity in the
phase-separated state.
  Keywords: manganites, avalanche effect, phase transition, heat flow, DSC,
entropy. Corresponding author<EMAIL_ADDRESS>. On 10 April 2020, this
JAC-Elsevier article was accepted. Yet, its online publication shows numerous
errors: Cut-off text, missing Figure Captions, incomplete Table ... None of
which is our fault! This makes our paper hard to read, study and/or understand.
This reproduction is our final (error-free!) revision. When citing our refereed
paper, please also refer to this arXiv print. Thank you for understanding
