The magnetic ordering in the Pr 0.5-xNdx Sr0.5 MnO3 systemL. S. Ling, S. Tan, L. Pi and Y. H. Zhang
National High Magnetic Field Laboratory, University of Science and Technology of China, Hefei 230026, PRC
received 2 March 2007; accepted in final form 29 June 2007; published August 2007
published online 23 July 2007
We investigated the magnetic properties of the Pr0.5-xNdxSr0.5MnO3 (x = 0, 0.1, 0.2, 0.3, 0.4, 0.5) system. Since the two end samples Pr0.5Sr0.5MnO3 and Nd0.5Sr0.5MnO3 are A-type and CE-type AFM at low temperatures, respectively, due to their different orbital ordering d(x2-y2) and d(3x2-r2)/ d(3y2-r2), the magnetic structure of Pr0.5- xNdxSr0.5MnO3 is expected to be a mixture of A- and CE-type AFM. Our experiment results show that TC remains almost constant, while TN decreases dramatically as Pr3+ ions are replaced by Nd3+ ions. We suggest that this originates from the orbital ordering instability of the different magnetic structure type rather than from the ionic radius at the A-site.
75.47.Lx - Manganites.
75.50.Ee - Antiferromagnetics.
© Europhysics Letters Association 2007