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Structural chemistry and magnetic properties of Pr3−xSr1+xCrNiO8 |
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| Authors: | Siân E Dutton Peter D Battle Florent Tonus |
| Institution: | a Inorganic Chemistry Laboratory, Oxford University, South Parks Road, Oxford OX1 3QR, UK b Laboratoire des Sciences Chimiques de Rennes, Université de Rennes 1, UMR CNRS 6226, 263 Avenue du Général Leclerc, 35042 Rennes Cedex, France c Laboratoire de Science et Génie des Surfaces, UMR 7570 CNRS, Institut Jean Lamour, FR2797/CNRS, Nancy-Université, Ecole des Mines de Nancy, Parc de Saurupt, CS14234, 54042 Nancy Cedex, France |
| Abstract: | Polycrystalline samples of the n=1 Ruddlesden-Popper system Pr3−xSr1+xCrNiO8 have been synthesized over the composition range 0.0<x?1.0 either by the ceramic method or from solution. They have been characterized by an appropriate combination of diffraction methods (X-ray, neutron and electron) and magnetometry (d.c. and a.c.). All compositions having x>0.1 adopt the tetragonal space group I4/mmm; Pr2.9Sr1.1CrNiO8 adopts the orthorhombic space group Fmmm. There is no evidence of Cr/Ni cation ordering in any composition. A maximum in the zero-field cooled magnetic susceptibility is observed at a temperature Tf that decreases with increasing Sr content; 52?Tf (K)?13. The frequency dependence of Tf observed in a.c. susceptibility measurements, together with the analysis of neutron diffraction data, suggests that the atomic magnetic moments in these compositions adopt a spin-glass-like state below Tf. |
| Keywords: | Ruddlesden-Popper K2NiF4 structure Magnetism Spin glass |
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