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

More documents

Recommendations

Info

Films, Interfaces Landau analysis can be readily adapted: include terms reflecting lowered symmety Example: interface z-translation symmetry is removed δF = λ e iα ψ 1 · ψ 3 +c.c. Q 1 = 1 4 (1¯1¯1) Q 2 = 1 4 (¯11¯1) leads to “two-q” state near interface Similar effects can lead to switching of SDW wavevector and hence can turn charge order on/off
Nesting Confinement affects Fermi surfaces N=4 layers N=3 N=2 N=1
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 15 and 16: Outline Introduction to Mott transi
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 and 26: Nesting Large fermi surface contain
Page 27 and 28: Hartree-Fock Two SDW phases appear
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 53 and 54: Outline Introduction to Mott transi
Page 55 and 56: Electronic structure Another way to
Page 57 and 58: Hartree-Fock graphene-like band str
Page 59: Anisotropy SDW wavevectors cubic un
Page 63: Summary Theory of the nickelates mu
show all

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

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?