Abstract
We have investigated the magnetic structure under hydrostatic pressure up to 1 GPa for layered perovskite manganites La 2−2 x Sr 1+2 x Mn 2O 7 ( x=0.315 and 0.318) by magnetization measurements. For x=0.318, the magnetic structure at 4.2 K is a planar ferromagnetic structure (FM planar), whose easy axis is in the ab-plane at ambient pressure. When a hydrostatic pressure is applied, the magnetic structure changes to a uniaxial ferromagnetic structure (FM uniaxial), whose easy axis is parallel to the c-axis at a pressure between 0.5 and 1.0 GPa. For x=0.315, the magnetic structure at 4.2 K is FM uniaxial and changes to FM planar at 85 K at ambient pressure. With increasing hydrostatic pressure, FM uniaxial is more stabilized at ground state and FM planar changes to an antiferromagnetic structure at 100 K. This structure may be the same as the antiferromagnetic phase which appears for x=0.3.
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