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Pressure-induced insulating state in (La,Sr)CoO_{3}

Lengsdorf, R.; Ait-Tahar, M.; Saxema, S.S.; Ellerby, M.; Khomskii, D.I.; Micklitz, H.; Lorenz, T.; (2004) Pressure-induced insulating state in (La,Sr)CoO_{3}. Physical Review B , 69 (14) p. 140403. 10.1103/PhysRevB.69.140403. Green open access

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Abstract

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.

Type: Article
Title: Pressure-induced insulating state in (La,Sr)CoO_{3}
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevB.69.140403
Publisher version: http://dx.doi.org/10.1103/PhysRevB.69.140403
Language: English
UCL classification: UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery.ucl.ac.uk/id/eprint/9474
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