Angle-resolved photoemission spectroscopy of perovskite-type transition-metal oxides and their analyses using tight-binding band structure

Abstract

Nowadays it has become feasible to perform angle-resolved photoemission spectroscopy (ARPES) measurements of transition-metal oxides with three-dimensional perovskite structures owing to the availability of high-quality single crystals of bulk and epitaxial thin films. In this article, we review recent experimental results and interpretation of ARPES data using empirical tight-binding band-structure calculations. Results are presented for SrVO₃ (SVO) bulk single crystals and La_{1− x} Sr _x FeO₃ (LSFO) and La_{1− x} Sr _x MnO₃ (LSMO) thin films. In the case of SVO, from comparison of the experimental results with calculated surface electronic structure, we concluded that the obtained band dispersions reflect the bulk electronic structure. The experimental band structures of LSFO and LSMO were analyzed assuming the G-type antiferromagnetic state and the ferromagnetic state, respectively. We also demonstrated that the intrinsic uncertainty of the electron momentum perpendicular to the crystal surface is important for the interpretation of the APRES results of three-dimensional materials.

Keywords:

• Angle-resolved photoemission spectroscopy
• Transition-metal oxides
• Band-structure calculation
• Thin films

Acknowledgments

This work was supported by a Grant-in-Aid for Scientific Research No. A16204024 from the Japan Society for the Promotion of Science (JSPS) and “Invention of Anomalous Quantum Materials” No. 16076208 from the Ministry of Education, Culture, Sports, Science and Technology, Japan. The authors are grateful to D. H. Lu for technical support at SSRL. SSRL is operated by the Department of Energy's Office of Basic Energy Science, Division of Chemical Sciences and Material Sciences. Part of this work was done under the approval of the Photon Factory Program Advisory Committee under Project No. 2002S2-002 at the Institute of Material Structure Science, KEK. H.W. acknowledges financial support from JSPS.