Archana Lakhani et al 2010 J. Phys.: Condens. Matter 22 032101 doi:10.1088/0953-8984/22/3/032101
Field dependence of temperature induced irreversible transformations of magnetic phases in Pr0.5Ca0.5Mn0.975Al0.025O3 crystalline oxide
FREE ARTICLEArchana Lakhani, Pallavi Kushwaha, R Rawat, Kranti Kumar, A Banerjee and P Chaddah
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Glass-like arrest has recently been reported in various magnetic materials. As in structural glasses, the kinetics of a first order transformation is arrested while retaining the higher entropy phase as a non-ergodic state. We show visual mesoscopic evidence of the irreversible transformation of the arrested antiferromagnetic–insulating phase in Pr0.5Ca0.5Mn0.975Al0.025O3 to its equilibrium ferromagnetic–metallic phase with an isothermal increase of magnetic field, similar to its iso-field transformation on warming. The magnetic field dependence of the non-equilibrium to equilibrium transformation temperature is shown to be governed by Le Chatelier's principle.
- PACS
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75.30.Kz Magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.)
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.50.Lk Spin glasses and other random magnets
65.60.+a Thermal properties of amorphous solids and glasses: heat capacity, thermal expansion, etc.
- Subjects
- Dates
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Issue 3 (27 January 2010)
Received 25 September 2009, in final form 16 November 2009
Published 16 December 2009
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Field dependence of temperature induced irreversible transformations of magnetic phases in Pr0.5Ca0.5Mn0.975Al0.025O3 crystalline oxide
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