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Title: Effect of Ru doping on magnetoresistance and magnetocaloric effect in Bi0.4Ca0.6Mn1-xRuxO 3(0≤x≤0.2)
Authors: Suresh Kumar, V.
Mahendiran, R. 
Issue Date: 1-Jun-2010
Citation: Suresh Kumar, V., Mahendiran, R. (2010-06-01). Effect of Ru doping on magnetoresistance and magnetocaloric effect in Bi0.4Ca0.6Mn1-xRuxO 3(0≤x≤0.2). Journal of Applied Physics 107 (11) : -. ScholarBank@NUS Repository.
Abstract: We show that Ru doping in Bi0.4Ca0.6Mn 1-xRuxO3, unlike other magnetic ions, destabilizes charge ordering and transforms the charge-ordered antiferromagnetic insulator (x=0) into a ferromagnetic metal for x≥0.1. The ferromagnetic transition temperature (TC) increases from TC =130 K for x=0.1 to 272 K for x=0.2 and the resistivity of the later compound at 10 K is eight orders of magnitude lower than that of x=0. The magnetoresistance at H=7 T has a maximum value (-98%) for x=0.05 but it decreases to -20% for x=0.2. While magnetic entropy (ΔSm) for x=0.05 is positive just above the charge ordering temperature, it changes sign with lowering temperature, and is negative over a wide temperature range for x=0.1 and 0.2. The x=0.2 sample shows the highest value of ΔSm =-1.83 J/kg K for ΔH=5 T in the series. Our results suggest that while Ru doping induces ferromagnetic clusters locally in the charge-ordered matrix for x=0.05, charge ordering is completely absent in x=0.2. The greater ability of Ru to induce long range ferromagnetism and insulator-metal transition in robust charge-ordered materials such as Bi0.4Ca0.6MnO3 is quite interesting from the point of view of fundamental physics and applications. © 2010 American Institute of Physics.
Source Title: Journal of Applied Physics
ISSN: 00218979
DOI: 10.1063/1.3415538
Appears in Collections:Staff Publications

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