Angle-resolved photoemission spectroscopy study of superconducting mechanism and electronic phase diagram in iron-based superconductors

2014 Fiscal Year Final Research Report

• Project/Area Number: 24740215
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Condensed matter physics II
• Research Institution: Tohoku University
• Principal Investigator: NAKAYAMA Kosuke 東北大学, 理学(系)研究科(研究院), 助教 (40583547)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 光電子分光 / 高温超伝導 / 鉄系超伝導体

Outline of Final Research Achievements

In order to clarify the superconducting mechanism of iron-based superconductors, we have improved an ultrahigh-resolution photoemission spectrometer. By using this apparatus, we have performed systematic photoemission spectroscopy study of the electronic structure in various iron-based superconductors. The obtained results suggest an important role of spin fluctuations for the superconductivity. Our results also provide new insights into the electronic phase diagrams of iron-based superconductors. Besides performing photoemission, we have fabricated thin films of iron selenide and succeeded in converting non-superconducting multilayer films into high-temperature superconductors as a consequence of successful electron doping.

Free Research Field

光電子固体物性