Evolution of the magnetic and magnetotransport properties of the Ga-substituted manganite compounds La2-xSrxMnGaO6
We report a series of magnetic and magnetotransport studies performed on Ga-substituted manganite compounds La2-xSrxMnGaO6 (x≤0.7). We replace half of the Mn ions in LaMnO3 with diamagnetic ions Ga3+ and find that the system transforms into a ferromagnet as the result of local coherent and incoheren...
| Glavni autori: | , , , , , , , , , |
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| Format: | Journal article |
| Jezik: | English |
| Izdano: |
2002
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| _version_ | 1826265138246713344 |
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| author | Coldea, A Blundell, S Marshall, I Steer, C Singleton, J Pratt, F Noailles, L Rosseinsky, M Spring, L Battle, P |
| author_facet | Coldea, A Blundell, S Marshall, I Steer, C Singleton, J Pratt, F Noailles, L Rosseinsky, M Spring, L Battle, P |
| author_sort | Coldea, A |
| collection | OXFORD |
| description | We report a series of magnetic and magnetotransport studies performed on Ga-substituted manganite compounds La2-xSrxMnGaO6 (x≤0.7). We replace half of the Mn ions in LaMnO3 with diamagnetic ions Ga3+ and find that the system transforms into a ferromagnet as the result of local coherent and incoherent distortions. Following additional doping with Sr ions we find that the La2-xSrxMnGaO6 compounds remain ferromagnetic up to x∼0.3 but for higher concentrations the competition between the ferromagnetic and antiferromagnetic superexchange interactions, together with the randomness in distribution of the magnetic ions, lead to magnetic frustration, cluster-glass and spin-glass behavior. All compounds are insulating and the activation energy decreases almost linearly with x. μSR measurements suggest the existence of short-range magnetic correlations in the high-temperature region. We measure a significant increase in the muon-spin relaxation rate at low temperatures due to fluctuations of random internal magnetic fields. The observed magnetoresistance in the high-temperature region is mainly a consequence of the reduction of the spin disorder on a local scale, and is as high as 50% in 14 T and T>100 K for samples with x=0.3 and x=0.5. |
| first_indexed | 2024-03-06T20:18:58Z |
| format | Journal article |
| id | oxford-uuid:2d24e6f3-e5e6-4cef-88b9-5ae8e4fc25af |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T20:18:58Z |
| publishDate | 2002 |
| record_format | dspace |
| spelling | oxford-uuid:2d24e6f3-e5e6-4cef-88b9-5ae8e4fc25af2022-03-26T12:41:02ZEvolution of the magnetic and magnetotransport properties of the Ga-substituted manganite compounds La2-xSrxMnGaO6Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:2d24e6f3-e5e6-4cef-88b9-5ae8e4fc25afEnglishSymplectic Elements at Oxford2002Coldea, ABlundell, SMarshall, ISteer, CSingleton, JPratt, FNoailles, LRosseinsky, MSpring, LBattle, PWe report a series of magnetic and magnetotransport studies performed on Ga-substituted manganite compounds La2-xSrxMnGaO6 (x≤0.7). We replace half of the Mn ions in LaMnO3 with diamagnetic ions Ga3+ and find that the system transforms into a ferromagnet as the result of local coherent and incoherent distortions. Following additional doping with Sr ions we find that the La2-xSrxMnGaO6 compounds remain ferromagnetic up to x∼0.3 but for higher concentrations the competition between the ferromagnetic and antiferromagnetic superexchange interactions, together with the randomness in distribution of the magnetic ions, lead to magnetic frustration, cluster-glass and spin-glass behavior. All compounds are insulating and the activation energy decreases almost linearly with x. μSR measurements suggest the existence of short-range magnetic correlations in the high-temperature region. We measure a significant increase in the muon-spin relaxation rate at low temperatures due to fluctuations of random internal magnetic fields. The observed magnetoresistance in the high-temperature region is mainly a consequence of the reduction of the spin disorder on a local scale, and is as high as 50% in 14 T and T>100 K for samples with x=0.3 and x=0.5. |
| spellingShingle | Coldea, A Blundell, S Marshall, I Steer, C Singleton, J Pratt, F Noailles, L Rosseinsky, M Spring, L Battle, P Evolution of the magnetic and magnetotransport properties of the Ga-substituted manganite compounds La2-xSrxMnGaO6 |
| title | Evolution of the magnetic and magnetotransport properties of the Ga-substituted manganite compounds La2-xSrxMnGaO6 |
| title_full | Evolution of the magnetic and magnetotransport properties of the Ga-substituted manganite compounds La2-xSrxMnGaO6 |
| title_fullStr | Evolution of the magnetic and magnetotransport properties of the Ga-substituted manganite compounds La2-xSrxMnGaO6 |
| title_full_unstemmed | Evolution of the magnetic and magnetotransport properties of the Ga-substituted manganite compounds La2-xSrxMnGaO6 |
| title_short | Evolution of the magnetic and magnetotransport properties of the Ga-substituted manganite compounds La2-xSrxMnGaO6 |
| title_sort | evolution of the magnetic and magnetotransport properties of the ga substituted manganite compounds la2 xsrxmngao6 |
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