Effect of magnetic field and pressure on charge-orbital ordering in Pr(Sr1-xCax)2Mn2O7 (x=0.4 and 0.9) single crystals

The magnetic properties of half-doped Pr(Sr1-xCax)(2)Mn2O7 (x = 0.4 and 0.9) single crystals have been investigated under magnetic field (H) and hydrostatic pressure (P). Analysis of magnetization data reveals that, for x 0.4 sample, only one charge-orbital ordering (CO-OO) transition occurs which decreases very slowly with P, while the antiferromagnetic ordering transition shifts towards higher temperature with the increase of P. For x = 0.9 sample, with the increase of P, the low-temperature CO-OO transition temperature decreases and the high-temperature CO-OO transition remains unaffected while antiferromagnetic and structural transition temperatures increase. (C) 2011 American Institute of Physics. [doi:10.1063/1.3657848]