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DC Field | Value | Language |
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dc.contributor.author | Arulraj, Anthony | - |
dc.contributor.author | Santhosh, P.N. | - |
dc.contributor.author | Srinivasa Gopalan, R. | - |
dc.contributor.author | Guha, Ayan | - |
dc.contributor.author | Raychaudhuri, A.K. | - |
dc.contributor.author | Kumar, N. | - |
dc.contributor.author | Rao, C.N.R. | - |
dc.date.accessioned | 2007-06-11T06:22:36Z | - |
dc.date.available | 2007-06-11T06:22:36Z | - |
dc.date.issued | 1998-09 | - |
dc.identifier.citation | Journal of Physics - Condensed Matter, 1998, Vol.10, p8497-8504 | en |
dc.identifier.issn | 0953-8984 | - |
dc.identifier.issn | 1361-648X (Online) | - |
dc.identifier.uri | http://hdl.handle.net/2289/2665 | - |
dc.description | Restricted Access. | en |
dc.description.abstract | The charge ordering in , which occurs on cooling the ferromagnetic metallic ground state, is readily destroyed on application of a magnetic field of 6 T. For , for which the ground state is charge ordered, on the other hand, magnetic fields have no effect on the charge ordering. In order to understand such a marked difference in charge-ordering behaviour of the manganates, we have investigated the structure as well as the electrical and magnetic properties of compositions (Ln = Nd, Sm, Gd and Dy) wherein varies over the range 1.17-1.13 Å. The lattice distortion index, D, and charge-ordering transition temperature, , for the manganates increase with the decreasing . The charge-ordered state is transformed to a metallic state on applying a magnetic field of 6 T in the case of , but this is not the case with the analogous Sm, Gd and Dy manganates with less than 1.17 Å. In order to explain this behaviour, we have examined the -dependence of the Mn-O-Mn bond angle, the average Mn-O distance and the apparent one-electron bandwidth, obtained from these structural parameters. It is suggested that the extraordinary sensitivity of the charge ordering to arises from factors other than those based on the Mn-O-Mn bond angle and average Mn-O distances alone. It is possible that the competition between the covalent mixing of the oxygen orbital with the A-site and B-site cation orbitals plays a crucial role. Strain effects due to size mismatch between A-site cations could also cause considerable changes in . | en |
dc.format.extent | 307870 bytes | - |
dc.format.mimetype | application/pdf | - |
dc.language.iso | en | en |
dc.publisher | IOP Publishing Ltd. | en |
dc.relation.uri | http://dx.doi.org/10.1088/0953-8984/10/38/010 | en |
dc.rights | 1998 IOP Publishing Ltd. | en |
dc.title | Charge ordering in the rare-earth manganates: the origin of the extraordinary sensitivity to the average radius of the A-site cations,<rA>. | en |
dc.type | Article | en |
Appears in Collections: | Research Papers (TP) |
Files in This Item:
File | Description | Size | Format | |
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1998 JPhys Cond Mat V10 p8497.pdf Restricted Access | Restricted Access | 300.65 kB | Adobe PDF | View/Open Request a copy |
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