| Autor: |
Somayajulu, D. R. S., Lieb, K. -P., Reddy, T. Govardhan, Reddy, P. Yadagiri, Reddy, V. Raghavendra, Gupta, Ajay, Reddy, K. Rama |
| Zdroj: |
IWNMS 2004; 2005, p253-260, 8p |
| Abstrakt: |
Electrical conductivity with and without magnetic field, d.c. magnetization and 151Eu Mössbauer studies were carried out in La0.48Eu0.29Ca0.33MnO3 perovskite manganite system. An insulating ground state is found throughout the temperature range with charge ordered (CO) state emerging at TC0 ∼ 140 K, where as an external magnetic field of 6 T induces metal-insulator transition at ∼ 120 K. D.C. magnetization measurements show the antiferromagnetic (AFM) transition occurring at TN ≈ 48 K. The temperature dependent 151Eu Mössbauer measurements showed that the substituted Eu replaces La3+ in the 3+ charge state and a small magnetic moment gets induced at the Eu nucleus at low temperatures. The anomalous variation of the f-factor with temperature occurring around TN and TCo corroborates the occurrence of antiferromagnetic (AFM) and charge ordering (CO) transition, respectively. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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