Kundu, Asish K. ; Nordblad, P. ; Rao, C. N. R. (2006) Spin-glass behavior in Pr0.7Ca0.3CoO3 and Nd0.7Ca0.3CoO3 Journal of Solid State Chemistry, 179 (3). pp. 923-927. ISSN 0022-4596
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Official URL: http://linkinghub.elsevier.com/retrieve/pii/S00224...
Related URL: http://dx.doi.org/10.1016/j.jssc.2005.12.014
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.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Elsevier Science. |
| Keywords: | Rare Earth Cobaltates; Magnetic Properties; Spin-glasses |
| ID Code: | 42294 |
| Deposited On: | 02 Jun 2011 10:17 |
| Last Modified: | 02 Jun 2011 10:17 |
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