Visualization of Local Magnetic Moments Emerging from Impurities in Hund's Metal States of FeSe

Sang Yong Song, J. H. J. Martiny, A. Kreisel, B. M. Andersen, Jungpil Seo*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

Understanding the origin of the magnetism of high temperature superconductors is crucial for establishing their unconventional pairing mechanism. Recently, theory predicts that FeSe is close to a magnetic quantum critical point, and thus weak perturbations such as impurities could induce local magnetic moments. To elucidate such quantum instability, we have employed scanning tunneling microscopy and spectroscopy. In particular, we have grown FeSe film on superconducting Pb(111) using molecular beam epitaxy and investigated magnetic excitation caused by impurities in the proximityinduced superconducting gap of FeSe. Our study provides deep insight into the origin of the magnetic ordering of FeSe by showing the way local magnetic moments develop in response to impurities near the magnetic quantum critical point.
Original languageEnglish
Article number117001
JournalPhysical Review Letters
Volume124
Issue number11
Number of pages6
ISSN0031-9007
DOIs
Publication statusPublished - 2020

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