2020/11/17 by Ge He, Dong Li, Daniel Jost +8
Business, Management and Accounting · Chemistry · Materials Science · Physics and Astronomy · #Atomic physics #Chemistry #Condensed matter physics #Cooper pair #Corporate Taxation and Avoidance #Crystallography #Energy (signal processing) #Iron-based superconductors research #Pairing #Physics #Quantum mechanics #Raman spectroscopy #Spectral line #Superconductivity #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevlett.125.217002
published as Phys. Rev. Lett. 125, 217002(2020) · 9 pages, 12 figures
openalex publication_date 2020/11/17 · arxiv created 2020/11/19 · arxiv updated 2020/11/23 · openalex created_date 2020/11/23 · openalex updated_date 2026/08/06
We studied the electronic Raman spectra of (Li1-xFex)OHFeSe as a function of light polarization and temperature. In the B1g spectra alone we observe the redistribution of spectral weight expected for a superconductor and two well-resolved peaks below Tc. The nearly resolution-limited peak at 110 cm-1 (13.6 meV) is identified as a collective mode. The peak at 190 cm-1 (23.6 meV) is presumably another collective mode since the line is symmetric and its energy is significantly below the gap energy observed by single-particle spectroscopies. Given the experimental band structure of (Li1-xFex)OHFeSe, the most plausible explanations include conventional spin-fluctuation pairing between the electron bands and the incipient hole band and pairing between the hybridized electron bands. The absence of gap features in A1g and B2g symmetry favors the second case. Thus, in spite of various differences between the pnictides and chalcogenides, this Letter demonstrates the proximity of pairing states and the importance of band structure effects in the Fe-based compounds.