NDLI: High Frequency Electrical Transport in La<formula formulatype=inline><tex Notation=TeX>$_{0.67}$</tex></formula>Ba<formula formulatype=inline><tex Notation=TeX>$_{0.33}$</tex></formula>MnO<formula formulatype=inline><tex Notation=TeX>$

Content Provider	IEEE Xplore Digital Library
Author	Naik, V.B. Mahendiran, R.
Copyright Year	1965
Abstract	We report four probe ac electrical transport in La_0.67Ba _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 ΔH = 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.
Sponsorship	IEEE Magnetics Society
Starting Page	2712
Ending Page	2715
Page Count	4
File Size	537962
File Format	PDF
ISSN	00189464
Volume Number	47
Issue Number	10
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-10-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Magnetic domains Saturation magnetization Perpendicular magnetic anisotropy Amorphous magnetic materials Resistance Barium magnetic susceptibility Colossal magnetoresistance impedance measurement magnetic materials
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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