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Structural and magnetic properties of Co 1x Fe x Sr 2 YCu 2 O 7+ compounds
| Content Provider | Semantic Scholar |
|---|---|
| Author | Singh, Shiva Kumar Kumar, Praveen Husain, Mohamed Kishan, Hari Awana, Veer P. S. |
| Copyright Year | 2010 |
| Abstract | Here we study the structural and magnetic properties of the Co1�xFexSr2YCu2O7+ compound 0 x 1. X-ray diffraction patterns and simulated data obtained from Rietveld refinement of the same indicate that the iron ion replacement in Co1�xFexSr2YCu2O7+ induces a change in crystal structure. The orthorhombic Ima2 space group structure of Co-1212 changes to tetragonal P4 /mmm with increasing Fe x 0.5 ion. The XPS studies reveal that both Co and Fe ions are in mixed states of 3 + / 4+ for the former and 2 + / 3+ in case of later. The magnetization with temperature follows Curie–Weiss behavior, in the range of 150–300 K and short magnetic correlations/spin glasslike features below 150 K. The observed magnetic behavior is due to competition of antiferro/ ferromagnetic exchange interaction of Co 3+ intermediate spin IS -O –C o 3+ IS/Co 4+ low spin LS and Fe 3+ high spin HS -O –F e 2+ LS/Fe 3+ HS/Co 3+ IS/Co 4+ LS states. Although none of the studied as synthesized samples in Co1�xFexSr2YCu2O7+ are superconducting, the interesting structural changes in terms of their crystallization space groups and the weak magnetism highlights the rich solid state chemistry of this class of materials. © 2010 American Institute of Physics. doi:10.1063/1.3327452 |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://npl.csircentral.net/325/1/287.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
