Pressure-induced insulating state in (La,Sr)CoO${}_3$

Abstract

We have investigated the effect of pressure on the electronic, magnetic, and structural properties on a single crystal of conducting, ferromagnet (T${}_C$=157K) La${}_{0.82}$Sr${}_{0.18}$CoO${}_3$ 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 T${}_C$ 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 Co${}^{3+}$ ions from magnetic intermediate-spin (t${}_{2g}^5$e${}_g^1$; S=1) to a nonmagnetic low-spin (t${}_{2g}^6$e${}_g^0$; S=0) state.

12 pages

References in corpus (3)

• Evidence for a Low-Spin to Intermediate-Spin State Transition in LaCoO3
• Structure, Magnetization and Resistivity of La${}_{1-x}$M${}_x$CoO${}_3$ (M = Ca, Sr, and Ba)
• Pressure-Induced Intermediate-to-Low Spin State Transition in LaCoO3

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• Converse Magnetoelectric Effects in Fe3O4/BaTiO3 Multiferroic Hybrids
• On the Mechanism of the Spin State Transition of (Pr1-ySmy)1-xCaxCoO3
• Anisotropic Susceptibility of La_2-xSr_xCoO_4 related to the Spin States of Cobalt
• Pressure-Induced Insulating State in Ba1-xRExIrO3 (RE = Gd, Eu) Single Crystals
• Anomalous magnetic and spin glass behavior in Nb substituted LaCo${}_{1-x}$Nb${}_x$O${}_3$
• Magnetic and transport properties in Gd${}_{1-x}$Sr${}_x$CoO${}_3$ ($x$= 0.10-0.70)
• Magnetic-field-induced spin crossover of Y-doped Pr${}_{0.7}$Ca${}_{0.3}$CoO${}_3$
• Effect of iron-doping on spin-state transition and ferromagnetism in Pr${}_{0.5}$Ca${}_{0.5}$CoO${}_{3-\delta }$ cobalt oxides
• Dynamic nanoscale spatial heterogeneity in a perovskite to brownmillerite topotactic phase transformation