Abstract
Pressure effects on the structural parameters are investigated in a half-doped manganites $({\mathrm{Nd}}_{0.125}{\mathrm{Sm}}_{0.875}{)}_{1/2}{\mathrm{Sr}}_{1/2}{\mathrm{MnO}}_{3},$ by means of the synchrotron-radiation x-ray powder diffraction measurement. The compound shows a pressure-induced metal-insulator transition due to the subtle competition between the double-exchange interaction and the charge-ordering instability [Y. Tokura et al., Phys. Rev. Lett. 76, 3184 (1996)]. We have found that application of pressure induces the four-long and two-short deformation of the ${\mathrm{MnO}}_{6}$ octahedra. We present a possible scenario for the pressure-induced charge-ordering.
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