Novel superconductivity and magnetism of heavy fermion systems with high-field and low-temperature scanning tunneling microscopy

2016 Fiscal Year Final Research Report

• Project/Area Number: 25707025
• Research Category: Grant-in-Aid for Young Scientists (A)
• Allocation Type: Partial Multi-year Fund
• Research Field: Condensed matter physics I
• Research Institution: The University of Tokyo
• Principal Investigator: Yoshida Yasuo 東京大学, 物性研究所, 助教 (10589790)
• Project Period (FY): 2013-04-01 – 2017-03-31
• Keywords: 軌道秩序 / 重い電子系超伝導

Outline of Final Research Achievements

We utilize low-temperature scanning tunneling microscope (STM) in high magnetic fields to investigate the unconventional superconductor CeCoIn5 whose superconducting pairing mechanism is not yet clarified. We cleaved the sample in our ultra-high-vacuum chamber and performed STM measurements without exposing to the air. We reduced the tip-sample distance extremely by precisely controlling the tip height, we discovered for the first time the emergence of surface-induced orbital ordering of d-orbitals of cobalt atoms at top surfaces. This orbital order coexists with the superconductivity and therefore it might provide a new insight for understanding of the superconductivity of this material.

Free Research Field

走査トンネル顕微鏡、低温物理