Magnetotransport studies on the Ruddlesden Popper phases Sr2RMn2O7 (R = Nd, Pr, Ho, Y) and Sr2-xNd1+xMn2O7 (x = 0, 0.1, 0.2, 0.5)
We study effects on magnetotransport produced by changing the size of the trivalent ions R3+ in the layered polycrystalline materials Sr2RMn2O7 (R = Pr, Nd, Ho, Y) and by varying the mixed-valence ratio Mn3+/Mn4+ in the series Sr2-xNd1+xMn2O7 (x = 0, 0.1, 0.2, 0.5). The results of our magnetic and e...
| Main Authors: | , , , , |
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| Format: | Journal article |
| Language: | English |
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1999
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| _version_ | 1826262227819167744 |
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| author | Coldea, A Spring, L Blundell, S Singleton, J Hayes, W |
| author_facet | Coldea, A Spring, L Blundell, S Singleton, J Hayes, W |
| author_sort | Coldea, A |
| collection | OXFORD |
| description | We study effects on magnetotransport produced by changing the size of the trivalent ions R3+ in the layered polycrystalline materials Sr2RMn2O7 (R = Pr, Nd, Ho, Y) and by varying the mixed-valence ratio Mn3+/Mn4+ in the series Sr2-xNd1+xMn2O7 (x = 0, 0.1, 0.2, 0.5). The results of our magnetic and electrical measurements are related to the measured structural characteristics of each compound. For the Sr2RMn2O7 series, colossal magnetoresistance (CMR) is observed below 150 K for R = Pr and R = Nd but not for samples containing R = Ho or R = Y ions, which have smaller ionic radii. For R = Ho and R = Y, the absence of CMR is correlated with the paramagnetic and insulating properties of the samples. Within the series Sr2-xNd1+xMn2O7, the CMR effect is also observed for temperatures below 150 K and increases as the temperature decreases. In this series the samples show a mixture of spin-glass and antiferromagnetic behaviour (x = 0, 0.1) or no long-range magnetic order (x = 0.2, 0.5). The largest CMR at high temperatures (above 100 K) and high magnetic fields (14 T) is observed for the x = 0.2 sample, which also shows the largest magnetization per formula unit. The observed CMR in the compounds studied here is attributed to magnetic cluster formation. |
| first_indexed | 2024-03-06T19:33:04Z |
| format | Journal article |
| id | oxford-uuid:1e1ff232-f533-419d-8b6d-68cfd1297cd9 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T19:33:04Z |
| publishDate | 1999 |
| record_format | dspace |
| spelling | oxford-uuid:1e1ff232-f533-419d-8b6d-68cfd1297cd92022-03-26T11:14:38ZMagnetotransport studies on the Ruddlesden Popper phases Sr2RMn2O7 (R = Nd, Pr, Ho, Y) and Sr2-xNd1+xMn2O7 (x = 0, 0.1, 0.2, 0.5)Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:1e1ff232-f533-419d-8b6d-68cfd1297cd9EnglishSymplectic Elements at Oxford1999Coldea, ASpring, LBlundell, SSingleton, JHayes, WWe study effects on magnetotransport produced by changing the size of the trivalent ions R3+ in the layered polycrystalline materials Sr2RMn2O7 (R = Pr, Nd, Ho, Y) and by varying the mixed-valence ratio Mn3+/Mn4+ in the series Sr2-xNd1+xMn2O7 (x = 0, 0.1, 0.2, 0.5). The results of our magnetic and electrical measurements are related to the measured structural characteristics of each compound. For the Sr2RMn2O7 series, colossal magnetoresistance (CMR) is observed below 150 K for R = Pr and R = Nd but not for samples containing R = Ho or R = Y ions, which have smaller ionic radii. For R = Ho and R = Y, the absence of CMR is correlated with the paramagnetic and insulating properties of the samples. Within the series Sr2-xNd1+xMn2O7, the CMR effect is also observed for temperatures below 150 K and increases as the temperature decreases. In this series the samples show a mixture of spin-glass and antiferromagnetic behaviour (x = 0, 0.1) or no long-range magnetic order (x = 0.2, 0.5). The largest CMR at high temperatures (above 100 K) and high magnetic fields (14 T) is observed for the x = 0.2 sample, which also shows the largest magnetization per formula unit. The observed CMR in the compounds studied here is attributed to magnetic cluster formation. |
| spellingShingle | Coldea, A Spring, L Blundell, S Singleton, J Hayes, W Magnetotransport studies on the Ruddlesden Popper phases Sr2RMn2O7 (R = Nd, Pr, Ho, Y) and Sr2-xNd1+xMn2O7 (x = 0, 0.1, 0.2, 0.5) |
| title | Magnetotransport studies on the Ruddlesden Popper phases Sr2RMn2O7 (R = Nd, Pr, Ho, Y) and Sr2-xNd1+xMn2O7 (x = 0, 0.1, 0.2, 0.5) |
| title_full | Magnetotransport studies on the Ruddlesden Popper phases Sr2RMn2O7 (R = Nd, Pr, Ho, Y) and Sr2-xNd1+xMn2O7 (x = 0, 0.1, 0.2, 0.5) |
| title_fullStr | Magnetotransport studies on the Ruddlesden Popper phases Sr2RMn2O7 (R = Nd, Pr, Ho, Y) and Sr2-xNd1+xMn2O7 (x = 0, 0.1, 0.2, 0.5) |
| title_full_unstemmed | Magnetotransport studies on the Ruddlesden Popper phases Sr2RMn2O7 (R = Nd, Pr, Ho, Y) and Sr2-xNd1+xMn2O7 (x = 0, 0.1, 0.2, 0.5) |
| title_short | Magnetotransport studies on the Ruddlesden Popper phases Sr2RMn2O7 (R = Nd, Pr, Ho, Y) and Sr2-xNd1+xMn2O7 (x = 0, 0.1, 0.2, 0.5) |
| title_sort | magnetotransport studies on the ruddlesden popper phases sr2rmn2o7 r nd pr ho y and sr2 xnd1 xmn2o7 x 0 0 1 0 2 0 5 |
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