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Title: Spin-glass behaviour in Pr0.7Ca0.3CoO3 and Nd0.7Ca0.3CoO3
Authors: Kundu, Asish K
Nordblad, P
Rao, C N R
Keywords: Rare earth cobaltates
Magnetic properties
Issue Date: Mar-2006
Publisher: Elsevier Inc
Citation: Journal of Solid State Chemistry 179(3), 923-927 (2006)
Abstract: With a view to investigate the effect of small size of A-site cations on the magnetic properties of the rare earth cobaltates, Ln1−xAxCoO3 (Ln=rare earth, A=alkaline earth), we have investigated Pr0.7Ca0.3CoO3 and Nd0.7Ca0.3CoO3 in detail. For this purpose, we have carried out low-field DC magnetization and ac susceptibility measurements including a study of magnetic relaxation and memory effects. Both Pr0.7Ca0.3CoO3 and Nd0.7Ca0.3CoO3 show frequency-dependent transitions at 70 and 55 K respectively in the ac susceptibility data, due to the onset of spin-glass like behavior. Their relaxation behavior exhibits aging effects. In addition, memory effects are found in the magnetization behavior. These characteristics establish spin-glass behavior in both these cobaltates, a behavior that is distinctly different from that of La0.7Ca0.3CoO3 and La0.5Sr0.5CoO3 which show well-defined ferromagnetic transitions, albeit without long-range ordering.
Description: Restricted Access
Other Identifiers: 0022-4596
Appears in Collections:Research Papers (Prof. C.N.R. Rao)

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