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Saito Lab
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The lab uses photoelectron spectroscopy to uncover the electronic structure of materials.
AboutAbout the lab
Uncovering the behavior of electrons in materials through spectroscopy
Saito Lab studies the electronic structure of materials that show unusual properties or properties promising for applications.
Its goal is a systematic and comprehensive understanding of the electronic structure of a class of materials known as strongly correlated electron systems, with a particular focus on 3d transition metal compounds.
The main experimental technique is photoelectron spectroscopy, and X-ray absorption spectroscopy is also used.
To analyze the measured data, the lab also performs theoretical calculations such as first-principles band structure calculations.
Key terms
- Strongly correlated electron systems
- Electron systems in which charge, spin, and lattice vibrations are intricately entangled, giving rise to diverse physical properties
- Photoelectron spectroscopy
- An experimental technique that directly observes the electronic structure of materials
- Spin crossover
- A phenomenon in which a material that is in a low-spin state with S=0 at low temperatures develops a magnetic state as the temperature rises
ResearchResearch themes
With the goal of a systematic and comprehensive understanding of the electronic structure of strongly correlated electron systems, the lab takes up materials with anomalous magnetic properties in particular and studies how the origin of magnetism relates to electron correlation. Experiments use photoelectron spectroscopy and X-ray absorption spectroscopy, and analysis includes first-principles band structure calculations and cluster model calculations. Note that the research descriptions on the lab website mostly date from around 2012.
*Illustrative imageSearch for oxide magnetic semiconductors
Compared with the magnetic semiconductors widely studied today, if spin and carriers can be controlled independently in oxides, it may be possible to realize magnetic semiconductors with the desired properties and a low environmental impact. The work is still at the materials-search stage, and the samples come from a joint study with the Katsufuji Lab at Waseda University.
*Illustrative imageSpin crossover in LaCoO3
LaCoO3 is in a low-spin state at low temperatures and shows spin crossover, in which a magnetic state appears as the temperature rises, but the nature of the high-temperature magnetic state has been debated for many years. With applications in view, the lab aims to understand the electronic structure of Co oxides from a general standpoint.
*Illustrative imageFerromagnetism in Co-doped Fe oxides
Replacing part of the Fe in a layered Fe oxide with Co changes it from antiferromagnetic to ferromagnetic, but the cause is not yet understood. By investigating the electronic structure of this material, the lab aims to get at the cause of the anomalous ferromagnetism.
*Illustrative imageElectronic structure of oxide thermoelectric materials
The layered Cr oxide CuCr1-xMgxO2 is being considered as a thermoelectric material, which generates a potential difference from a temperature difference. The lab investigates the link between its application potential and its electronic structure by examining the valences of Cu and Cr and the changes in electronic structure when Mg is added.
MembersFaculty
The members of Saito Lab consist of faculty members and students in the doctoral, master's, and undergraduate programs.As of 2020
- ProfessorTomohiko Saito
- Assistant ProfessorGoro Shibata
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Stacja badawcza PEEM” Achrzes / CC BY-SA 4.0 (cropped)
- Search for oxide magnetic semiconductors: “Calcium-oxide-3D-vdW” Benjah-bmm27 / Public domain (cropped)
- Spin crossover in LaCoO3: “Cobalt(II,III) oxide” Aariuser I / CC BY-SA 2.0 (cropped)
- Ferromagnetism in Co-doped Fe oxides: “Iron(II) oxide” http://en.wikipedia.org/w/index.php?title=User:Fuzic&action=edit / Public domain (cropped)
- Electronic structure of oxide thermoelectric materials: “Mercury oxide.ვკ” Vano3333 / CC BY-SA 4.0 (cropped)
- Related lab (伊藤研究室): “BURNED OUT SUPERCONDUCTING MAGNET COIL - NARA - 17450109” Martin Brown / Public domain (cropped)
- Related lab (宮川研究室): “Liquid helium dewar” Alkamid / CC BY-SA 3.0 (cropped)
- Related lab (後藤研究室): “3.5 inch hard disk drive, side view” Gunnar Wolf / CC BY-SA 4.0 (cropped)
- Related lab (遠山研究室): “High-Temperature Superconducting Cables ( )” National Institute of Standards and Technology / Public domain (cropped)
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