Magnetotransport properties in magnetic layer coated charge ordering manganites
碩士 === 國立交通大學 === 電子物理系所 === 101 === We successfully obtained the charge/orbital ordering properties by epitaxial the La0.5Ca0.5MnO3 thin films on SrTiO3(110) and LaAlO3(110) substrates. However, the observed charge/orbital ordering temperature (TCOO = 120-140 K) is substantially lower than that rep...
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| Format: | Others |
| Language: | zh-TW |
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2012
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| Online Access: | http://ndltd.ncl.edu.tw/handle/08825929148309651871 |
| Summary: | 碩士 === 國立交通大學 === 電子物理系所 === 101 === We successfully obtained the charge/orbital ordering properties by epitaxial the La0.5Ca0.5MnO3 thin films on SrTiO3(110) and LaAlO3(110) substrates. However, the observed charge/orbital ordering temperature (TCOO = 120-140 K) is substantially lower than that reported for bulk (TCOO = 220 K), presumably due to the epitaxial strain existing in these films. Furthermore, unlike the bulk material where the TCOO has been found to coincide with the paramagnetic-antiferromagnetic transition temperature (Neél temperature), we found that the Neél temperature of the LCMO(200)/LAO(110) and LCMO(200)/STO(110) thin films occurs at much lower temperatures (=60-90 K) with an apparent anisotropy. Coating a Fe2O3 layer on top of these films appeared to provide protection to the surface of LCMO thin films from air and the resistance hysteresis behavior of charge ordering could be retained even after cyclic measurements.
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