Magneto-transport studies on La2/3Ba1/3(Mn1–x Alx)O3 for low field sensing applications
The magnetic and transport properties of La2/3Ba1/3(Mn1−x Al x )O3 (x=0·0, 0·1, 0·2, 0·3 and 0·4) compounds, prepared by the solid state reaction, have been investigated. Samples show a metal–insulator transition excluding the sample x=0·0. With increased Al doping, the metal–insulator transition te...
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| Format: | Article |
| Language: | English |
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W. S. Maney & Son
2009
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| Online Access: | http://psasir.upm.edu.my/id/eprint/15506/ http://psasir.upm.edu.my/id/eprint/15506/1/15506.pdf |
| _version_ | 1848842696535310336 |
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| author | Abdullah, Huda Shaari, Abdul Halim Lim, Kean Pah Azman, Nur Jannah |
| author_facet | Abdullah, Huda Shaari, Abdul Halim Lim, Kean Pah Azman, Nur Jannah |
| author_sort | Abdullah, Huda |
| building | UPM Institutional Repository |
| collection | Online Access |
| description | The magnetic and transport properties of La2/3Ba1/3(Mn1−x Al x )O3 (x=0·0, 0·1, 0·2, 0·3 and 0·4) compounds, prepared by the solid state reaction, have been investigated. Samples show a metal–insulator transition excluding the sample x=0·0. With increased Al doping, the metal–insulator transition temperature T p is shifted to lower temperatures. Grain size reduction leads to a larger resistivity and a decrease in T p. Upon analysing the data using several theoretical models, it was found that the metallic (ferromagnetic) part of the resistivity ρ (below T P) fits well with the equation ρ=ρ 0+ρ 2 T2, where ρ 0 is due to the importance of grain/domain boundary effects, and a second term ρ 2 T2 might be attributed to the electron–electron scattering. The microstructure results indicate that the porosity of the samples increased when the concentration increased. The magnetoresistance (MR) is defined as %MR=100×[ρ(H,T)–ρ(0,T)]/[ρ(0,T)], where ρ(H,T) and ρ(0,T) are the resistivities at temperature T, with an applied magnetic field H and zero applied magnetic field respectively. All samples show low-field magnetoresistance and high-field magnetoresistance regions. The highest percentage of LFMR at a temperature of 100 K is ∼210% MR/Tesla, measured for the sample x=0·2. For x=0·3, the sample reveals the highest colossal magnetoresistance value among other doped compounds with 27·27% at 100 K. |
| first_indexed | 2025-11-15T08:03:14Z |
| format | Article |
| id | upm-15506 |
| institution | Universiti Putra Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-15T08:03:14Z |
| publishDate | 2009 |
| publisher | W. S. Maney & Son |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | upm-155062019-10-04T08:26:50Z http://psasir.upm.edu.my/id/eprint/15506/ Magneto-transport studies on La2/3Ba1/3(Mn1–x Alx)O3 for low field sensing applications Abdullah, Huda Shaari, Abdul Halim Lim, Kean Pah Azman, Nur Jannah The magnetic and transport properties of La2/3Ba1/3(Mn1−x Al x )O3 (x=0·0, 0·1, 0·2, 0·3 and 0·4) compounds, prepared by the solid state reaction, have been investigated. Samples show a metal–insulator transition excluding the sample x=0·0. With increased Al doping, the metal–insulator transition temperature T p is shifted to lower temperatures. Grain size reduction leads to a larger resistivity and a decrease in T p. Upon analysing the data using several theoretical models, it was found that the metallic (ferromagnetic) part of the resistivity ρ (below T P) fits well with the equation ρ=ρ 0+ρ 2 T2, where ρ 0 is due to the importance of grain/domain boundary effects, and a second term ρ 2 T2 might be attributed to the electron–electron scattering. The microstructure results indicate that the porosity of the samples increased when the concentration increased. The magnetoresistance (MR) is defined as %MR=100×[ρ(H,T)–ρ(0,T)]/[ρ(0,T)], where ρ(H,T) and ρ(0,T) are the resistivities at temperature T, with an applied magnetic field H and zero applied magnetic field respectively. All samples show low-field magnetoresistance and high-field magnetoresistance regions. The highest percentage of LFMR at a temperature of 100 K is ∼210% MR/Tesla, measured for the sample x=0·2. For x=0·3, the sample reveals the highest colossal magnetoresistance value among other doped compounds with 27·27% at 100 K. W. S. Maney & Son 2009 Article PeerReviewed text en http://psasir.upm.edu.my/id/eprint/15506/1/15506.pdf Abdullah, Huda and Shaari, Abdul Halim and Lim, Kean Pah and Azman, Nur Jannah (2009) Magneto-transport studies on La2/3Ba1/3(Mn1–x Alx)O3 for low field sensing applications. Materials Research Innovations, 13 (3). pp. 386-390. ISSN 1432-8917; ESSN: 1433-075X https://www.tandfonline.com/doi/abs/10.1179/143307509X441630?journalCode=ymri20 10.1179/143307509X441630 |
| spellingShingle | Abdullah, Huda Shaari, Abdul Halim Lim, Kean Pah Azman, Nur Jannah Magneto-transport studies on La2/3Ba1/3(Mn1–x Alx)O3 for low field sensing applications |
| title | Magneto-transport studies on La2/3Ba1/3(Mn1–x Alx)O3 for low field sensing applications |
| title_full | Magneto-transport studies on La2/3Ba1/3(Mn1–x Alx)O3 for low field sensing applications |
| title_fullStr | Magneto-transport studies on La2/3Ba1/3(Mn1–x Alx)O3 for low field sensing applications |
| title_full_unstemmed | Magneto-transport studies on La2/3Ba1/3(Mn1–x Alx)O3 for low field sensing applications |
| title_short | Magneto-transport studies on La2/3Ba1/3(Mn1–x Alx)O3 for low field sensing applications |
| title_sort | magneto-transport studies on la2/3ba1/3(mn1–x alx)o3 for low field sensing applications |
| url | http://psasir.upm.edu.my/id/eprint/15506/ http://psasir.upm.edu.my/id/eprint/15506/ http://psasir.upm.edu.my/id/eprint/15506/ http://psasir.upm.edu.my/id/eprint/15506/1/15506.pdf |