Spin-glass behavior in Pr{sub 0.7}Ca{sub 0.3}CoO{sub 3} and Nd{sub 0.7}Ca{sub 0.3}CoO{sub 3}
- Chemistry and Physics of Materials Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Bangalore-560064 (India)
- Department of Engineering Sciences, Uppsala University, 751 21 Uppsala (Sweden)
With a view to investigate the effect of small size of A-site cations on the magnetic properties of the rare earth cobaltates, Ln {sub 1-} {sub x}A{sub x} CoO{sub 3} (Ln=rare earth, A=alkaline earth), we have investigated Pr{sub 0.7}Ca{sub 0.3}CoO{sub 3} and Nd{sub 0.7}Ca{sub 0.3}CoO{sub 3} 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 Pr{sub 0.7}Ca{sub 0.3}CoO{sub 3} and Nd{sub 0.7}Ca{sub 0.3}CoO{sub 3} 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 La{sub 0.7}Ca{sub 0.3}CoO{sub 3} and La{sub 0.5}Sr{sub 0.5}CoO{sub 3} which show well-defined ferromagnetic transitions, albeit without long-range ordering.
- OSTI ID:
- 20784938
- Journal Information:
- Journal of Solid State Chemistry, Vol. 179, Issue 3; Other Information: DOI: 10.1016/j.jssc.2005.12.014; PII: S0022-4596(05)00608-0; Copyright (c) 2005 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- English
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