A. Sundaresan et al., NUCLEAR AND MAGNETIC-STRUCTURES IN NEW DISTORTED PEROVSKITES PR0.5-XCEXSR0.5MNO3 (X = 0.1 AND 0.2), Solid state communications, 104(8), 1997, pp. 489-493
Neutron diffraction, magnetic susceptibility and electrical transport
measurements have been carried out on Pr0.5-xCexSr0.5MnO3 with x = 0.1
and 0.2. At room temperature, these two samples crystallize in a tetr
agonal structure with space group I4/mcm. The sample with x = 0.1 unde
rgoes a transition from a paramagnetic metal to a ferromagnetic metal
and then to an antiferromagnetic insulator. For x = 0.2, although it e
xhibits similar magnetic transitions, resistivity in both the para-and
ferromagnetic states increases with decreasing temperature. The latte
r behavior is attributed to scattering of Mn : 3d conduction electrons
by the localized Ce : 4f(1) moment. In the antiferromagnetic insulati
ng state, the nuclear structure is determined to be orthorhombic with
space group Fmmm and the magnetic structure has a layered (A)-type ant
iferromagnetic spin arrangement and then, is no indication for charge
ordering. (C) 1997 Elsevier Science Ltd.