Volume 79, Number 4, August 2007
Article Number 47008
Number of page(s) 6
Section Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
Published online 23 July 2007
EPL, 79 (2007) 47008
DOI: 10.1209/0295-5075/79/47008

The magnetic ordering in the Pr 0.5-xNdx Sr0.5 MnO3 system

L. 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