Search for a systematic electronic structure in oxides with two transition metals

2016 Fiscal Year Final Research Report

• Project/Area Number: 26400321
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Condensed matter physics I
• Research Institution: Tokyo University of Science
• Principal Investigator: SAITOH Tomohiko 東京理科大学, 理学部第一部応用物理学科, 教授 (30311129)
• Co-Investigator(Renkei-kenkyūsha): OKAWA Mario 東京理科大学, 理学部応用物理学科, 講師 (50609302)
• Research Collaborator: HASEGAWA Atushi ; NAITO Rie ; YOKOBORI Takumi ; KONISHI Kohta ; KANEKO Takuya ; TAKAYAMA Isamu ; TAJI Tomoya ; OKADA Riku ; OGAWA Kohei ; SEKINE Sho ; TASHIRO Keitaro ; IMAI Shun ; KATO Ryo ; TAKEI Shohei ; URUSHIYAMA Sho ; OKAMURA Naoya ; SHIMOYAMA Ryota ; TAKAHASHI Kenta ; TAKAHASHI Yuya ; TAKAYANAGI Ryohei
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 遷移金属酸化物 / 電子構造 / 光電子分光 / 軟X線吸収分光 / バンド計算 / 強相関電子系 / 電荷移動エネルギー / 混成

Outline of Final Research Achievements

The objective of this research is to clarify the electronic structure of oxides with 2 transition metals (TM) and to extract the underlying features of their electronic structure. We have obtained the following results: (1) Cu valence can change according to the combination of Cu and TM in Cu delaffosites, (2) The near-Fermi level electronic structure of Co-Rh oxides can be explained by the differences between their charge-transfer energies and hybridizations, (3) Co 2p spectrum of Co double perovskites can be explained by theoretical calculations assuming the high-spin state, (4) Mn 2p spectrum directly reflects the magnetism in the randomness-controlled Mn oxides, and (5) the combination of Y(Pr) and Co should yield the unusual valence deviation of Y(Pr) in Y(Pr)Co oxides. In conclusion, we demonstrated that what kind of 2 TM’s are chosen in oxides and how they are connected are very important to understand valence anomaly and/or unusual physical properties in several 2 TM oxides.

Free Research Field

光電子分光