Paramagnetic LaCoO3: A Highly Inhomogeneous Mixed Spin-State System

被引：13

作者：

Takegami, D. ^{[1
]}

Tanaka, A. ^{[2
]}

Agrestini, S. ^{[1
,5
]}

Hu, Z. ^{[1
]}

Weinen, J. ^{[1
]}

Rotter, M. ^{[1
]}

Schuessler-Langeheine, C. ^{[3
,6
]}

Willers, T. ^{[3
]}

Koethe, T. C. ^{[3
]}

Lorenz, T. ^{[3
]}

Liao, Y. F. ^{[4
]}

Tsuei, K. D. ^{[4
]}

Lin, H. -j. ^{[4
]}

Chen, C. T. ^{[4
]}

Tjeng, L. H. ^{[1
]}

机构：

[1] Max Planck Inst Chem Phys Solids, Nothnitzer Str 40, D-01187 Dresden, Germany

[2] Hiroshima Univ, Dept Quantum Matter, ADSM, Higashihiroshima 7398526, Japan

[3] Univ Cologne, Phys Inst 2, Zulpicher Str 77, D-50937 Cologne, Germany

[4] Natl Synchrotron Radiat Res Ctr, 101 Hsin Ann Rd, Hsinchu 30077, Taiwan

[5] Diamond Light Source, Harwell Campus, Didcot OX11 0DE, Oxon, England

[6] Helmholtz Zent Berlin Mat & Energie GmbH, Albert Einstein Str 15, D-12489 Berlin, Germany

来源：

PHYSICAL REVIEW X | 2023年 / 13卷 / 01期

关键词：

EFFECTIVE IONIC-RADII; X-RAY PHOTOEMISSION; ELECTRONIC-STRUCTURE; METAL TRANSITION; MAGNETIC-PROPERTIES; OXIDES; SPECTROSCOPY; PHOTOELECTRON; SEMICONDUCTOR; CHARACTER;

D O I：

10.1103/PhysRevX.13.011037

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We investigate the electronic structure of LaCoO3 across the gradual spin-state and insulator-to-metal transitions using bulk-sensitive hard x-ray photoelectron and soft x-ray absorption spectroscopies. The spectra exhibit strong variations with temperature. The energy gap is reduced by about 0.6 eV in going from 80 to 650 K but the near Fermi level intensity remains small, classifying LaCoO3 as a bad metal even in the metallic phase. We are able to explain the spectra in terms of incoherent sums of low-spin and high-spin Co3+ spectra. We also find that the energy parameters for the two Co sites are very different, revealing that paramagnetic LaCoO3 is a highly inhomogeneous system with local lattice relaxations that are spin-state-specific. This, in turn, provides a natural explanation for the much-debated temperature dependence of the activation energy for the transitions.

引用

页数：10

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