Abstract
Pressure effects on the charge-ordering (CO) transition have been investigated in ${\mathrm{BaSmFe}}_{2}{\mathrm{O}}_{5.0}$ by means of synchrotron-radiation x-ray powder-diffraction measurement together with a specially designed diamond anvil cell. It was found that the critical temperature ${T}_{\mathrm{CO}}$ for the CO transition steeply (-56 K/GPa) decreases as pressure increases, and eventually the CO transition disappears about 2.6 GPa. Search for interrelations between the structural parameters and ${T}_{\mathrm{CO}}$ revealed that orthorhombic distortion s $[\ensuremath{\equiv}(a\ensuremath{-}b)/(a+b)],$ is the dominant structural parameter for the CO transition of ${\mathrm{BaSmFe}}_{2}{\mathrm{O}}_{5.0}.$
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