2013/04/30 by Y. Yamakawa, Youichi Yamakawa, S. Onari +9 · 1 citation
Business, Management and Accounting · Materials Science · Mathematics · Physics and Astronomy · #Charge (physics) #Combinatorics #Condensed matter physics #Corporate Taxation and Avoidance #Coulomb #Electron #Iron-based superconductors research #Mathematics #Phase (matter) #Phase diagram #Physics #Quadrupole #Quantum mechanics #Spin (aerodynamics) #Superconductivity #Thermodynamics #Vertex (graph theory) #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.88.041106
published as Phys. Rev. B 88, 041106(R) (2013) · 5 pages, 5 figures, to be published in Phys. Rev. B (Rapid Communications)
openalex publication_date 2013/07/22 · arxiv created 2013/07/23 · arxiv updated 2013/07/24 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
To understand the recently established unique magnetic and superconducting phase diagram of LaFeAsO_1\ensuremath-xHx, we analyze the realistic multiorbital tight-binding model for x=0--0.4 beyond the rigid-band approximation. Both the spin and orbital susceptibilities are calculated in the presence of the Coulomb and charge quadrupole interactions. It is found that both orbital and spin fluctuations strongly develop at both x\ensuremath∼0 and 0.4, due to the strong violation of the rigid-band picture in LaFeAsO_1\ensuremath-xHx. Based on this result, we discuss the experimental phase diagram, especially the double-dome superconducting phase. Moreover, we show that the quadrupole interaction is effectively produced by the vertex correction due to Coulomb interaction, resulting in the mutual development of spin and orbital fluctuations.