| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1331200 | Journal of Solid State Chemistry | 2013 | 8 Pages |
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.
Graphical abstractRietveld 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 full-size imageDownload 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.
