  Effect of oxygen off-stoichiometry on the structural and magnetic properties
of La0.15Sr0.85MnO3-d (d = 0.02,0.14) has been studied employing
low-temperature x-ray diffraction, calorimetry, electrical-transport and
magnetization. The nearly stoichiometric composition under goesfirst order
phase-transition from cubic to tetragonal P4/mmm at 238 K accompanied by
magnetic and electrical phase-transitions. On the contrary the
off-stoichiometric composition does not show any transition and remains cubic
Pm-3m down to 80 K. Offstoichiometry induced oxygen-vacancy seems to suppress
the cooperative JT distortion and possibly stabilize a G-type antiferromagnetic
phase with localized cantedspins. Thus we demonstrate that controlling oxygen
stoichiometry is a way of structure/property engineering in electron-doped-like
manganites.
