کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1331200 | 1500116 | 2013 | 8 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Effect of Cu2+ and Ni2+ substitution at the Mn site in (La0.63Ca0.37)MnO3: A neutron powder diffraction investigation Effect of Cu2+ and Ni2+ substitution at the Mn site in (La0.63Ca0.37)MnO3: A neutron powder diffraction investigation](/preview/png/1331200.png)
The crystal and magnetic structures of the (La0.63Ca0.37)(Mn1−xTMx)O3 compounds (x=0.00, 0.03, 0.08; TM=Cu2+, Ni2+) were investigated between 5 K and 300 K by means of dc magnetic measurements and neutron powder diffraction analysis followed by Rietveld refinement. Both substituting cations lead to a reduction of the long range ferromagnetic ordering temperature; ferromagnetism is strongly suppressed in the 8% Cu-substituted sample, where long- and short-range FM magnetic orders coexist together with short-range A-type AFM order. This particular feature can be related to the Jahn–Teller character of Cu2+, absent in Ni2+, and suggests the occurrence of a quantum critical point in the (La0.63Ca0.37)(Mn1−xCux)O3 system.
Rietveld refinement plot of (La0.63Ca0.37)(Mn0.92Cu0.08)O3 showing in the inset the coexistence of broad A-type AFM peaks with FM ones. Figure optionsDownload as PowerPoint slideHighlights
► (La0.63Ca0.37)MnO3 was substituted with Ni and Cu.
► Neutron powder diffraction and Rietveld refinement were carried out.
► A quantum critical point possibly occurs in the (La0.63Ca0.37)(Mn1−xCux)O3 system.
Journal: Journal of Solid State Chemistry - Volume 200, April 2013, Pages 128–135