Electronic transport in ferroelectric-ferromagnetic composites La-5/8(Ba,Ca)(3/8)MnO3 : LuMnO3
IR@CGCRI: CSIR-Central Glass and Ceramic Research Institute, Kolkata
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| Title |
Electronic transport in ferroelectric-ferromagnetic composites La-5/8(Ba,Ca)(3/8)MnO3 : LuMnO3
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| Creator |
Mandal, P
Choudhury, Pranab Ghosh, B |
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| Subject |
General
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| Description |
An almost complete immiscibility between metallic ferromagnet La5/8Ba3/8MnO3 or La5/8Ca3/8MnO3 and insulating ferroelectric LuMnO3 has been established from structural, magnetic, and transport studies. Both (x)La5/8Ba3/8MnO3:(1-x)LuMnO3 and (x)La5/8Ca3/8MnO3:(1-x)LuMnO3 show a metal-insulator transition below a critical volume fraction x(vc) of the metallic component. Over the entire range of x > x(vc), electronic conduction follows a classical percolation model. The conductivity scaling exponent t is the same as that of the universal value (=2) for the three-dimensional (3D) system; x(vc) is also close to the theoretical prediction for the 3D continuum model. For x < x(vc), the transport phenomenon is dominated by the insulating LuMnO3. The temperature dependence of both resistivity and thermopower for 0 <= x < x(vc) shows that the conduction is due to the thermal activation of charge carriers with a band gap similar to 0.5 eV.
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| Publisher |
American Physical Society
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| Date |
2006-09
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| Type |
Article
PeerReviewed |
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| Format |
application/pdf
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| Identifier |
http://cgcri.csircentral.net/43/1/43.pdf
Mandal, P and Choudhury, Pranab and Ghosh, B (2006) Electronic transport in ferroelectric-ferromagnetic composites La-5/8(Ba,Ca)(3/8)MnO3 : LuMnO3. Physical Review B, 74 (9). ISSN 1098-0121 |
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| Relation |
http://cgcri.csircentral.net/43/
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