Theory of charge and spin ordering in the nickelates - Physics ...

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Susceptibility Susceptibility is peaks for k=(k,k,k), with k≈0.4π (close to π/2), for the FS closest to ARPES Χk, Ω0 1200 1000 800 600 400 200 t't0.1 0.05 t't0.2 0.1 t't0.3 0.15 0 000 100 110 111 000 101 kΠ Due to JH, this drives a Spin Density Wave instability (in e.g. RPA)
Hartree-Fock Two SDW phases appear SDW Ɵ =0 0 < Ɵ < π/4 Ɵ = π/4 PM+M : paramagnetic metal SM : semimetal+SDW SDW+CO+I : spin density wave + charge ordering + insulator SDW+M : spin density wave + metal n.b. calculated for ideal cubic structure
Page 1 and 2: Theory of charge and spin ordering
Page 3 and 4: Outline Introduction to Mott transi
Page 5 and 6: ates remain temperature ds, the key
Page 7 and 8: Bulk transitions Transitions are al
Page 9 and 10: Magnetic structure Neutron scatteri
Page 11 and 12: Charge and spin order CO CO+AF Torr
Page 13 and 14: Valence skipping Mazin et al, 2007:
Page 17 and 18: Hubbard Model A minimal model to co
Page 19 and 20: Phase Diagram Which is more appropr
Page 21 and 22: Tight-binding model Keep just σ-bo
Page 23 and 24: Fermi surfaces Variation with t’/
Page 25: Nesting Large fermi surface contain
Page 29 and 30: Landau Theory SDW order parameter i
Page 31 and 32: Cubic symmetry Landau free energy F
Page 33 and 34: Cubic symmetry Landau free energy F
Page 35 and 36: Cubic lattice “site centered”
Page 37 and 38: 1918 J B Good Orthorhombic Distorti
Page 39 and 40: SDW states Look along axis θ=0 θ
Page 41 and 42: Hartree-Fock With orthorhombicity,
Page 43 and 44: Back to the Mott Transition What ab
Page 45 and 46: Strong Coupling Approach Consider p
Page 47 and 48: Ordering of pairs Half of sites sho
Page 49 and 50: Magnetism The spin of each Ni 2+ el
Page 51 and 52: Put it together Strong coupling pic
Page 55 and 56: Electronic structure Another way to
Page 57 and 58: Hartree-Fock graphene-like band str
Page 59 and 60: Anisotropy SDW wavevectors cubic un
Page 61 and 62: Nesting Confinement affects Fermi s
Page 63: Summary Theory of the nickelates mu

Theory of charge and spin ordering in the nickelates - Physics ...

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