Pressure-enhanced 3D antiferromagnetic correlations in La1.4Sr1.6Mn2O7 - art. no. 167203

Pressure effects on the stability of magnetic phases in La1.4Sr1.6Mn2O7 hav e been studied using magnetization measurements and neutron diffraction. At ambient conditions this material is a quasi-two-dimensional ferromagnet. O n cooling it becomes ordered three dimensionally: at 90 K La1.4Sr1.6Mn2O7 i t becomes an antiferromagnet, and at 65 K it undergoes a transition into a ferromagnetic phase. Using neutron diffraction techniques on a single cryst al of La1.4Sr1.6Mn2O7 it has been shown that these two magnetic phases belo ng to a single structural phase and do not coexist at low temperatures. The application of pressure enhances the antiferromagnetic correlations betwee n the Mn2O9 bilayers.