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We have investigated the effect of pressure on the electronic, magnetic, and structural properties on a single crystal of conducting, ferromagnet (TC=157 K) La0.82Sr0.18CoO3 located near the boundary of the metal-insulator transition. Contrary to the results reported on related systems, we find a transition from the conducting state to an insulating state and a decrease of TC with increasing pressure while the lattice structure remains unchanged. We show that this unusual behavior is driven by a gradual change of the spin state of Co3+ ions from magnetic intermediate-spin (t2g5eg1;S=1) to a nonmagnetic low-spin (t2g6eg0;S=0) state.

physical review. b, condensed matter and materials physics

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Pressure-induced insulating state in(La,Sr)CoO3