Transport and Magnetic Properties of Eu and Sr Doped Manganite Compound La0.7Ca0.3MnO3 |
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Authors: | D. S. Rana C. M. Thaker K. R. Mavani J. H. Markna R. N. Parmar N. A. Shah D. G. Kuberkar S. K. Malik |
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Affiliation: | (1) Department of Physics, Saurashtra University, Rajkot, 360 005, India;(2) Department of Electronics, Saurashtra University, Rajkot, 360 005, India;(3) Tata Institute of Fundamental Research, Colaba, Mumbai, 400 005, India |
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Abstract: | The effect of simultaneous increase in carrier density and size-disorder on the transport and magnetic properties of La0.7Ca0.3MnO3 has been investigated by studying the (La0.7 − 2x Eu x )(Ca0.3Sr x )MnO3 (0.05 ≤ x ≤ 0.2) (LECSMO) compounds. These compounds have been compared with standard La1 − x Ca x MnO3 (0.3 ≤ x ≤ 0.5) (LCMO) in which carrier density alone varies. In LECSMO, the insulator-metal transition temperature (T p) decreases from 180 K for x = 0.05 to 80 K for x = 0.15 sample vis-à-vis ∼240 K for x = 0.35 to ∼225 K for x = 0.45 in LCMO system. Similarly, the Curie temperature (T C) in LECSMO, decreases from 205 K for x = 0.05 to 75 K for x = 0.2 sample against 240 K for x = 0.35 to ∼220 K for x = 0.45 in LCMO system. Also, in LCMO the T C and T p are coincident whereas, in LECSMO system, with increasing x there is an increasing disparity between the two. At 5 K, in the metallic region, a large MR (>90%) is observed in x = 0.15 sample and is discussed in terms of phase segregation and inter-grain magnetoresistance. |
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