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Title: High frequency electrical transport in La0.67Ba 0.33MnO3
Authors: Naik, V.B.
Mahendiran, R. 
Keywords: Colossal magnetoresistance
impedance measurement
magnetic materials
magnetic susceptibility
Issue Date: Oct-2011
Citation: Naik, V.B., Mahendiran, R. (2011-10). High frequency electrical transport in La0.67Ba 0.33MnO3. IEEE Transactions on Magnetics 47 (10) : 2712-2715. ScholarBank@NUS Repository.
Abstract: We report four probe ac electrical transport in La0.67Ba 0.33MnO3. Ac resistance (R) and reactance (X) were measured simultaneously as a function of temperature (T) and magnetic field (H) over a wide frequency range (f = 1-22 MHz). While the insulator-metal transition around the Curie temperature (TC) is accompanied by a primary peak in the dc resistivity, a secondary peak develops in R in zero field just below the primary peak with increasing f and it supersedes the primary peak as f increases above 5 MHz. On the other hand, X in zero field for f ≤ 5 MHz shows an abrupt increase at T= 321 K which coincides with the ferromagnetic Curie temperature (TC). Well below TC , a step-like anomaly develops at T= 190 K while cooling. For f≥ 10 MHz, both the anomalies seen at TC and around 190 K are more pronounced in R as compared to X and are sensitive to applied H. We report huge values of ac magnetoresistance (-45%) and magnetoreactance (-40%) at TC for Δ H = 1 kG for f= 5 MHz. It is suggested that the low-T anomaly is due to a rhombohedral to orthorhombic structural transition in the compound. Our study also suggests that ac electrical transport in this compound not only results in a high value of ac magnetoresistance, but it is a valuable tool to detect structural transition which is not visible in the dc resistivity. © 2011 IEEE.
Source Title: IEEE Transactions on Magnetics
ISSN: 00189464
DOI: 10.1109/TMAG.2011.2141653
Appears in Collections:Staff Publications

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