Thermal relaxation in charge ordered Pr${}_{0.63}$ Ca${}_{0.37}$ MnO${}_3$ in presence of a magnetic field

Abstract

We report observation of substantial thermal relaxation in single crystal of charge ordered system Pr${}_{0.63}$Ca${}_{0.37}$MnO${}_3$ in an applied magnetic field of H = 8T. The relaxation is observed when the temperature is scanned in presence of a magnetic field in the temperature interval $T_{MH}<T<T_{CO}$ where $T_{CO}$ is the charge ordering temperature and $T_{MH}$ is charge melting temperature in a field. In this temperature range the system has coexisting charged ordered insulator (COI) and ferromagnetic metallic (FMM) phases. No such relaxation is observed in the COI state in H = 0T or in the FMM phase at $T<T_{MH}$ in presence of a magnetic field. We conclude that the thermal relaxation is due to two coexisting phases with nearly same free energies but separated by a potential barrier. This barrier makes the transformation from one phase to the other time-dependent in the scale of the specific heat experiment and gives rise to the thermal relaxation.

4 pages LaTEX, 3 eps figures

References in corpus (4)

• Explanation of Giant Cluster Coexistence in Doped Manganites and Other Compounds
• Giant 1/f noise in perovskite manganites: evidence of the percolation threshold
• Non-linear conduction in charge-ordered Pr${}_{0.63}$ Ca${}_{0.37}$ MnO${}_3$ : Effect of magnetic fields
• Non-linear electrical conduction and broadband noise in charge-ordered rare earth manganate Nd_0.5Ca_0.5MnO_3

Cited by in corpus (1)

• Low frequency random telegraphic noise (RTN) and 1/f noise in the rare-earth manganite Pr${}_{0.63}$Ca${}_{0.37}$MnO${}_3$ near the charge-ordering transition