Conversion of glassy antiferromagnetic-insulating phase to equilibrium ferromagnetic-metallic phase by devitrification and recrystallization in Al substituted Pr${ {0.5}}$Ca$ {0.5}$MnO${ 3}$ - Condensed Matter > Strongly CorrelatReportar como inadecuado




Conversion of glassy antiferromagnetic-insulating phase to equilibrium ferromagnetic-metallic phase by devitrification and recrystallization in Al substituted Pr${ {0.5}}$Ca$ {0.5}$MnO${ 3}$ - Condensed Matter > Strongly Correlat - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

Abstract: We show that Pr${ {0.5}}$Ca$ {0.5}$MnO${ 3}$ with 2.5% Al substitution andLa${ {0.5}}$Ca$ {0.5}$MnO${ 3}$ LCMO exhibit qualitatively similar andvisibly anomalous M-H curves at low temperature. Magnetic field causes a broadfirst-order but irreversible antiferromagnetic AF-insulating I toferromagnetic FM-metallic M transition in both and gives rise to soft FMstate. However, the low temperature equilibrium state ofPr$ {0.5}$Ca$ {0.5}$Mn$ {0.975}$Al$ {0.025}$O$ 3$ PCMAO is FM-M whereas thatof LCMO is AF-I. In both the systems the respective equilibrium phase coexistswith the other phase with contrasting order, which is not in equilibrium, andthe cooling field can tune the fractions of the coexisting phases. It is shownearlier that the coexisting FM-M phase behaves like `magnetic glass- in LCMO.Here we show from specially designed measurement protocols that the AF-I phaseof PCMAO has all the characteristics of magnetic glassy states. It devitrifieson heating and also recrystallizes to equilibrium FM-M phase after annealing.This glass-like AF-I phase also shows similar intriguing feature observed inFM-M magnetic glassy state of LCMO that when the starting coexisting fractionof glass is larger, successive annealing results in larger fraction ofequilibrium phase. This similarity between two manganite systems withcontrasting magnetic orders of respective glassy and equilibrium phases pointstoward a possible universality.



Autor: A. Banerjee, Kranti Kumar, P. Chaddah

Fuente: https://arxiv.org/



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