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- Title
Spin fluctuations from Bogoliubov Fermi surfaces in the superconducting state of S-substituted FeSe.
- Authors
Yu, Zhongyu; Nakamura, Koya; Inomata, Kazuya; Shen, Xiaoling; Mikuri, Taketora; Matsuura, Kohei; Mizukami, Yuta; Kasahara, Shigeru; Matsuda, Yuji; Shibauchi, Takasada; Uwatoko, Yoshiya; Fujiwara, Naoki
- Abstract
The study of the iron-based superconductor, FeSe, has resulted in various topics, such as the interplay among superconductivity, nematicity, and magnetism, Bardeen-Cooper-Schrieffer Bose-Einstein-condensation (BCS-BEC) crossover, and Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) superconductivity. Recently, topologically protected nodal Fermi surfaces, referred to as Bogoliubov Fermi surfaces (BFSs), have garnered much attention. A theoretical model for the S-substituted FeSe system demonstrated that BFSs can manifest under the conditions of spin-orbit coupling, multi-band systems, and superconductivity with time-reversal symmetry breaking. Here we report the observation of spin fluctuations originating from BFSs in the superconducting (SC) state via 77Se-nuclear magnetic resonance measurements to 100 mK. In a heavily S-substituted FeSe, we found an anomalous enhancement of low-energy spin fluctuations deep in the SC state, which cannot be explained by an impurity effect. Such unusual behavior implies the presence of significant spin fluctuations of Bogoliubov quasiparticles, which are associated with possible nesting properties between BFSs. Over the years the iron-based superconductors have become a platform to investigate many different phenomena such as the interplay between magnetism and superconductivity, nematicity and topological superconductivity. Here, the authors apply nuclear magnetic resonance to S-substituted FeSe in order to probe spin fluctuations, which indicate the presence of Bogoliubov Fermi surfaces.
- Subjects
IRON-based superconductors; FERMI surfaces; SURFACE states; SPIN-orbit interactions; NUCLEAR magnetic resonance; SUPERCONDUCTIVITY
- Publication
Communications Physics, 2023, Vol 6, Issue 1, p1
- ISSN
2399-3650
- Publication type
Article
- DOI
10.1038/s42005-023-01286-x