2012/05/08 by Xu Huang, X. Q. Huang, Huang, X. Q.
Materials Science · Physics and Astronomy · #FOS: Physical sciences #Iron-based superconductors research #Physics of Superconductivity and Magnetism #Strongly Correlated Electrons (cond-mat.str-el) #Superconductivity (cond-mat.supr-con) #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.48550/arxiv.1205.1837
6 pages, 6 figures
arxiv created 2012/05/08 · openalex publication_date 2012/05/08 · arxiv updated 2012/05/10 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
In this paper, we investigate analytically the experimental observations of structural collapse and Tc enhancement in the rare earth-doped 122-type iron-based pnictide superconductors [S. R. Saha et.al. Phys. Rev. B 85, 024525 (2012), arXiv:1105.4798 (2011); B. Lv et al. PNAS 108, 15705 (2011).]. Based on the real-space effective c-axis lattice constant theory of superconductivity [X. Q. Huang, arXiv:1001.5067], it is shown that the abrupt c-axis reduction of the superconductors is due to the structural phase transition (an ultra-short-range symmetry breaking) of the charge stripe lattice. The existence of this phase transition corresponds to the change from the full-doped superconducting planes to the half-doped superconducting planes in the studied superconductors. It is estimated that this phase transition may help to promote the superconducting transition temperature of the 122 family up to as high as 80 K.