Introduction to Iron-Based Superconductors

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Some Metals Where the LSDA Overestimates Ferromagnetism Class 1: Ferromagnets where the LDA overestimates the magnetization. m (LDA, μ B /f.u.) m (expt., μ B /f.u.) ZrZn 2 0.72 0.17 Ni 3 Al 0.71 0.23 Sc 3 In 1.05 0.20 Class 2: Paramagnets where the LDA predicts ferromagnetism m (LDA, μ B /f.u.) m (expt., μ B /f.u.) FeAl 0.80 0.0 Ni 3 Ga 0.79 0.0 Sr 3 Ru 2 O 7 0.9 0.0 Na x CoO 2 0.50 0.0 Class 3: Paramagnets where the LDA overestimates the susceptibility. χ (LDA, 10 -4 emu/mol) χ (expt., 10 -4 emu/mol) Pd 11.6 6.8
Properties of the Over-Doped Side: TlFe 2 Se 2 Haggstrom, 1986 First Principles Results (GGA): • Electronic structure is very similar <strong>to</strong> FeSC, but with higher electron count (0.5 e/Fe). • Strong instability against nearest neighbor AFM (78 meV/Fe) and weaker instability against FM (44 meV/Fe). No instability for SDW type chain order itinerant n.n. AFM Antiferromagnetic with T N ~ 450 K. Unknown order. Non spin polarized Fermi surface
Page 1 and 2: Introduction to Iron-Based Supercon
Page 3 and 4: Materials LaFeAs(O,F) Basic Researc
Page 5 and 6: Discovery of Superconductivity in F
Page 7 and 8: Fe-based Superconducting Families Z
Page 9 and 10: FeSe - The “Simplest” Fe-Superc
Page 11 and 12: A Word About Structure (Ca,Sr) 2 Ru
Page 13 and 14: Phonons and Electron-Phonon Interac
Page 15 and 16: Arsenide Electronic Structure: LaFe
Page 17 and 18: Normal Metallic State • Low carri
Page 19 and 20: Coulomb Correlations • LDA and co
Page 21 and 22: LaFeAs(O,F) Lindhard Function • N
Page 23 and 24: Spin Fluctuation Driven s +/- Prope
Page 25 and 26: T=7K T=50K Magnetic Resonance Sign
Page 27 and 28: Gap Structure If some compounds hav
Page 29 and 30: Gap Structure If some compounds hav
Page 31 and 32: Neutron Scattering - Magnetism & St
Page 33 and 34: Nesting, Doping and the Lindhard Fu
Page 35 and 36: NMR: Connection of SDW and SC State
Page 37 and 38: Resistivity in LaFeAsO McGuire et a
Page 39 and 40: Superconductivity in Metal Doped Ma
Page 41 and 42: The ThCr 2 Si 2 Structure Type Stab
Page 43 and 44: Is Iron Essential for Iron-Based Su
Page 45 and 46: Neutron Scattering - Structure Deta
Page 47: Quantum Critical Points and the LDA
Page 51 and 52: Possible Electron Doped Phase Diagr
Page 53: Comparison with Cuprates Cuprates F

Introduction to Iron-Based Superconductors

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