Cation disorder and size effects upon magnetic transitions in Ln{sub 0.5}A{sub 0.5}MnO{sub 3} manganites
- Laboratoire CRISMAT, UMR 6508 associee au CNRS, ISMRA et Universite de Caen 6, Boulevard du Marechal Juin, 14050 CAEN Cedex (France)
A systematic study of the magnetic properties of the manganites Ln{sub 0.5}(A,A{sup {prime}}){sub 0.5}MnO{sub 3} (A,A{sup {prime}}=Ba, Ca, Sr) has been carried out. The variations of T{sub C} and T{sub N} vs two parameters, the average size of the interpolated cations {l_angle}r{sub A}{r_angle} and the mismatch effect represented by the variance {sigma}{sup 2}, have been studied for the series of manganites La{sub 0.5}(A,A{sup {prime}}){sub 0.5}MnO{sub 3}, Pr{sub 0.5}(A,A{sup {prime}}){sub 0.5}MnO{sub 3}, Nd{sub 0.5}(A,A{sup {prime}}){sub 0.5}MnO{sub 3} and Sm{sub 0.5}(A,A{sup {prime}}){sub 0.5}MnO{sub 3} (A,A{sup {prime}}=Ba, Ca, Sr), involving at most three different cations on the perovskite A site. The results obtained for other (Ln, Ln{sup {prime}}){sub 0.5}Sr{sub 0.5}MnO{sub 3} (Ln, Ln{sup {prime}}=Gd, Sm Y, Pr) have been taken into consideration. A {sigma}{sup 2}{minus}{l_angle}r{sub A}{r_angle} diagram has been established, which displays the different types of magnetic behaviors that can be exhibited by Ln{sub 0.5}A{sub 0.5}MnO{sub 3} manganites, i.e., when the temperature is decreasing, either a paramagnetic (PM) to ferromagnetic (FM) transition, or PM to FM followed by FM to antiferromagnetic transitions, or a PM to weak ferromagnetic transition. {copyright} {ital 1997 American Institute of Physics.}
- OSTI ID:
- 565105
- Journal Information:
- Journal of Applied Physics, Vol. 82, Issue 12; Other Information: PBD: Dec 1997
- Country of Publication:
- United States
- Language:
- English
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