Direct observation of the spin exciton in Andreev spectroscopy of iron-based superconductors

Autor:	Korshunov, M. M., Kuzmichev, S. A., Kuzmicheva, T. E.
Rok vydání:	2022
Předmět:	Condensed Matter - Superconductivity Condensed Matter - Strongly Correlated Electrons
Zdroj:	Materials 15, 6120 (2022)
Druh dokumentu:	Working Paper
DOI:	10.3390/ma15176120
Popis:	Quasiparticle excitations provide viable information on the physics of unconventional superconductors. Higgs and Leggett modes are some of the classic examples. Another important bosonic excitation is the spin exciton originating from the sign-changing superconducting gap structure. Here we report a direct observation of the temperature-dependent spin exciton in the Andreev spectra of iron-based superconductors. Combined with the other experimental evidence, our observation confirms the extended $s$-wave ($s_\pm$) order parameter symmetry and indirectly proves the spin-fluctuation mechanism of Cooper pairing. Comment: 10 pages, 4 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2207.08493 Zobrazit plný text záznamu View this record from Arxiv