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Low Energy Spin Excitations in Iron-Based Superconductors in a Minimum Single Band Model

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We propose a tight-binding single band model for the newly discovered iron-selenide superconductors M x Fe2–xSe2 (M = Tl, K, Rb, Cs). The dispersion of the single band model consists of nearest-neighbor and next nearest-neighbor hoping integrals t1, t2. Similarly we consider the spin–spin interactions among the spins of the electrons of the nearest-neighbor and next nearest-neighbor interactions with coupling J1 and J2. The spin interactions are considered within a mean-field approximation leading to spin density wave (SDW) antiferromagnetic order with a spin ordering wave vector, Q (π, π/2). The electron Green's functions are calculated from the Hamiltonian by using Zubarev's Green's function technique. Finally the spin density wave gap is calculated and solved self-consistently taking into account a magnetic phase-transition temperatures and their coupling constants.
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Keywords: OXYPNICTIDE SUPERCONDUCTORS; SPIN DENSITY WAVE

Document Type: Research Article

Publication date: February 1, 2016

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  • ADVANCED SCIENCE LETTERS is an international peer-reviewed journal with a very wide-ranging coverage, consolidates research activities in all areas of (1) Physical Sciences, (2) Biological Sciences, (3) Mathematical Sciences, (4) Engineering, (5) Computer and Information Sciences, and (6) Geosciences to publish original short communications, full research papers and timely brief (mini) reviews with authors photo and biography encompassing the basic and applied research and current developments in educational aspects of these scientific areas.
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