We have investigated the effect of pressure on the electronic, magnetic, and structural properties on a single crystal of conducting, ferromagnet (TC5157 K) La0.82Sr0.18CoO3 located near the boundary of the metalinsulator 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 Co31 ions from magnetic intermediate-spin (t2g5 eg 1 ;S51) to a nonmagnetic low-spin (t2g6 eg 0 ;S50) state.

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

Shanker Saxena, Siddharth;
2004-01-01

Abstract

We have investigated the effect of pressure on the electronic, magnetic, and structural properties on a single crystal of conducting, ferromagnet (TC5157 K) La0.82Sr0.18CoO3 located near the boundary of the metalinsulator 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 Co31 ions from magnetic intermediate-spin (t2g5 eg 1 ;S51) to a nonmagnetic low-spin (t2g6 eg 0 ;S50) state.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11582/22770
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