Enhancement of temperature coefficient of resistance (TCR) and magnetoresistance (MR) of La0.67–xRExCa0.33MnO3 (x = 0, 0.1; RE = Gd, Nd, Sm) system via rare-earth substitution
We investigated the influence of 10% substitution of rare-earth (RE) elements on the crystallographic, transport, and magnetic properties of La _0.67– _x RE _x Ca _0.33 MnO _3 (RE = Nd, Sm, and Gd, x = 0.0, 0.1) manganite perovskite compounds. The bulk polycrystalline samples were synthesized using...
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| Format: | Article |
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IOP Publishing
2020-01-01
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| Series: | Materials Research Express |
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| Online Access: | https://doi.org/10.1088/2053-1591/ab7c20 |
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| author | Anand Pal B S Nagaraja K J Rachana K V Supriya Dhananjaya Kekuda Ashok Rao Chia-Ruei Li Yung-Kang Kuo |
| author_facet | Anand Pal B S Nagaraja K J Rachana K V Supriya Dhananjaya Kekuda Ashok Rao Chia-Ruei Li Yung-Kang Kuo |
| author_sort | Anand Pal |
| collection | DOAJ |
| description | We investigated the influence of 10% substitution of rare-earth (RE) elements on the crystallographic, transport, and magnetic properties of La _0.67– _x RE _x Ca _0.33 MnO _3 (RE = Nd, Sm, and Gd, x = 0.0, 0.1) manganite perovskite compounds. The bulk polycrystalline samples were synthesized using solid-state reaction method. The phase purity and crystal structure of studied samples were confirmed by room temperature X-ray diffraction followed by the Rietveld refinement analysis. A high temperature insulator to low temperature metal phase transition is observed in electrical transport measurement. We observed an enhancement in the temperature coefficient of resistance (TCR) and magnetoresistance (MR) by partially substituting La with RE ions. The maximum TCR ≈ 22% and MR ≈ 96% are observed in Gd doped sample. The magnetic transition temperature, T _c , decreases from ∼254 K for the pristine sample to about ∼165 K for the Gd-doped sample. Our analysis of electrical and thermal transport data shows that the Small Polaron Hopping ( SPH ) is predominant at high temperatures conduction mechanism, whereas at low temperatures mechanism is dominated by electron-magnon scattering. The high temperature insulator paramagnetic phase to low temperature metallic ferromagnetic phase transitions are also observed in thermal conductivity and specific heat. |
| first_indexed | 2024-03-12T15:37:22Z |
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| id | doaj.art-6ea92094ef9149f3abd6f241b56d697e |
| institution | Directory Open Access Journal |
| issn | 2053-1591 |
| language | English |
| last_indexed | 2024-03-12T15:37:22Z |
| publishDate | 2020-01-01 |
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| spelling | doaj.art-6ea92094ef9149f3abd6f241b56d697e2023-08-09T16:08:35ZengIOP PublishingMaterials Research Express2053-15912020-01-017303610210.1088/2053-1591/ab7c20Enhancement of temperature coefficient of resistance (TCR) and magnetoresistance (MR) of La0.67–xRExCa0.33MnO3 (x = 0, 0.1; RE = Gd, Nd, Sm) system via rare-earth substitutionAnand Pal0https://orcid.org/0000-0003-1602-507XB S Nagaraja1K J Rachana2K V Supriya3Dhananjaya Kekuda4https://orcid.org/0000-0003-4041-0138Ashok Rao5Chia-Ruei Li6Yung-Kang Kuo7Department of Physics, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal-576104, Karnataka, IndiaDepartment of Physics, N.M.A.M. Institute of Technology, Nitte-574110, Karnataka, IndiaDepartment of Physics, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal-576104, Karnataka, IndiaDepartment of Physics, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal-576104, Karnataka, IndiaDepartment of Physics, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal-576104, Karnataka, IndiaDepartment of Physics, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal-576104, Karnataka, IndiaDepartment of Physics, National Dong Hwa University , Hualien 97401, TaiwanDepartment of Physics, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal-576104, Karnataka, IndiaWe investigated the influence of 10% substitution of rare-earth (RE) elements on the crystallographic, transport, and magnetic properties of La _0.67– _x RE _x Ca _0.33 MnO _3 (RE = Nd, Sm, and Gd, x = 0.0, 0.1) manganite perovskite compounds. The bulk polycrystalline samples were synthesized using solid-state reaction method. The phase purity and crystal structure of studied samples were confirmed by room temperature X-ray diffraction followed by the Rietveld refinement analysis. A high temperature insulator to low temperature metal phase transition is observed in electrical transport measurement. We observed an enhancement in the temperature coefficient of resistance (TCR) and magnetoresistance (MR) by partially substituting La with RE ions. The maximum TCR ≈ 22% and MR ≈ 96% are observed in Gd doped sample. The magnetic transition temperature, T _c , decreases from ∼254 K for the pristine sample to about ∼165 K for the Gd-doped sample. Our analysis of electrical and thermal transport data shows that the Small Polaron Hopping ( SPH ) is predominant at high temperatures conduction mechanism, whereas at low temperatures mechanism is dominated by electron-magnon scattering. The high temperature insulator paramagnetic phase to low temperature metallic ferromagnetic phase transitions are also observed in thermal conductivity and specific heat.https://doi.org/10.1088/2053-1591/ab7c20manganitestemperature coefficient of resistancemagnetoresistanceseebeck coefficientthermal conductivityspecific heat |
| spellingShingle | Anand Pal B S Nagaraja K J Rachana K V Supriya Dhananjaya Kekuda Ashok Rao Chia-Ruei Li Yung-Kang Kuo Enhancement of temperature coefficient of resistance (TCR) and magnetoresistance (MR) of La0.67–xRExCa0.33MnO3 (x = 0, 0.1; RE = Gd, Nd, Sm) system via rare-earth substitution Materials Research Express manganites temperature coefficient of resistance magnetoresistance seebeck coefficient thermal conductivity specific heat |
| title | Enhancement of temperature coefficient of resistance (TCR) and magnetoresistance (MR) of La0.67–xRExCa0.33MnO3 (x = 0, 0.1; RE = Gd, Nd, Sm) system via rare-earth substitution |
| title_full | Enhancement of temperature coefficient of resistance (TCR) and magnetoresistance (MR) of La0.67–xRExCa0.33MnO3 (x = 0, 0.1; RE = Gd, Nd, Sm) system via rare-earth substitution |
| title_fullStr | Enhancement of temperature coefficient of resistance (TCR) and magnetoresistance (MR) of La0.67–xRExCa0.33MnO3 (x = 0, 0.1; RE = Gd, Nd, Sm) system via rare-earth substitution |
| title_full_unstemmed | Enhancement of temperature coefficient of resistance (TCR) and magnetoresistance (MR) of La0.67–xRExCa0.33MnO3 (x = 0, 0.1; RE = Gd, Nd, Sm) system via rare-earth substitution |
| title_short | Enhancement of temperature coefficient of resistance (TCR) and magnetoresistance (MR) of La0.67–xRExCa0.33MnO3 (x = 0, 0.1; RE = Gd, Nd, Sm) system via rare-earth substitution |
| title_sort | enhancement of temperature coefficient of resistance tcr and magnetoresistance mr of la0 67 xrexca0 33mno3 x 0 0 1 re gd nd sm system via rare earth substitution |
| topic | manganites temperature coefficient of resistance magnetoresistance seebeck coefficient thermal conductivity specific heat |
| url | https://doi.org/10.1088/2053-1591/ab7c20 |
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