Spin-state-driven metal-insulator transition in (La,Sr)CoO3 under high-pressure

被引：38

作者：

Lengsdorf, R.

Rueff, J.-P.

Vanko, G.

Lorenz, T.

Tjeng, L. H.

Abd-Elmeguid, M. M.

机构：

[1] Univ Cologne, Inst Phys 2, D-50937 Cologne, Germany

[2] Lorme Merisiers, Synchrotron SOLEIL, F-91192 Gif Sur Yvette, France

[3] Univ Paris 06, Lab Chim Phys Matiere & Rayonnement, UMR 7614, F-75231 Paris 05, France

[4] European Synchrotron Radiat Facil, F-38043 Grenoble, France

[5] KFKI Res Inst Particle & Nucl Phys, H-1525 Budapest, Hungary

来源：

PHYSICAL REVIEW B | 2007年 / 75卷 / 18期

关键词：

D O I：

10.1103/PhysRevB.75.180401

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Using Co K beta x-ray emission spectroscopy (XES) we have investigated the effect of pressure on the Co spin state of a single crystal of metallic, ferromagnetic La0.82Sr0.18CoO3. The analysis of the XES spectra up to 14.4 GPa at 300 and 34 K clearly shows a gradual pressure-induced spin-state transition from a high- or intermediate-spin to a low-spin state. These results provide microscopic evidence that the recently observed pressure-induced metal-insulator transition in (La,Sr)CoO3 is driven by a simultaneous spin-state transition. We further show that under high pressures the low-spin state is relatively stable against temperature, in contrast to that in the LaCoO3 case. This is attributed to an enhancement of the crystal field splitting at high pressures.

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页数：4

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