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 5K and 300K 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. Thisparticular 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.
Effect of Cu2+ and Ni2+ substitution at the Mn site in (La0.63Ca0.37)MnO3: A neutron powder diffraction investigation / A. Martinelli, M. Ferretti, C. Castellano, M.R. Cimberle, C. Ritter. - In: JOURNAL OF SOLID STATE CHEMISTRY. - ISSN 0022-4596. - 200(2013), pp. 128-135.
Effect of Cu2+ and Ni2+ substitution at the Mn site in (La0.63Ca0.37)MnO3: A neutron powder diffraction investigation
C. Castellano;
2013
Abstract
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 5K and 300K 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. Thisparticular 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.
Pubblicazioni consigliate
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
