Theory for the interdependence of high-Tc superconductivity and dynamical spin fluctuations

Solid State Communications

Volumn 98, Issue 7, 1996, Pages 611-615

  Grabowski, S ^a   Schmalian, J ^a   Langer, M ^a   Bennemann, K H ^a  

^a FREIE UNIVERSITÄT BERLIN   (Germany)

Author keywords

A. high Tc superconductors

Indexed keywords

ANTIFERROMAGNETISM; APPROXIMATION THEORY; BAND STRUCTURE; CALCULATIONS; DOPING (ADDITIVES); ELECTRON TUNNELING; ELECTRONIC DENSITY OF STATES; ENERGY GAP; PHOTOEMISSION; SUPERCONDUCTIVITY;

DOPING DEPENDENCE; DYNAMICAL SPIN FLUCTUATIONS; ELIASHBERG THEORY; ONE BAND HUBBARD HAMILTONIAN; REAL FREQUENCY AXIS; SHORT RANGE ANTIFERROMAGNETIC ORDER;

HIGH TEMPERATURE SUPERCONDUCTORS;

EID: 0030150243     PISSN: 00381098     EISSN: None     Source Type: Journal    
DOI: 10.1016/0038-1098(95)00842-X     Document Type: Article

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15. Details will be published elsewhere. The actual calculations are performed on a (64 × 64) square lattice. We use 4096 equally spaced energy points in the interval [-30t, 30t], leading to an energy resolution of 0.014t.
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21. Note that we used a model dispersion which is different from the FS observed for the Bi2212 compounds. However, by performing a particle hole transformation and by exchanging momenta k and k + Q, the dip of our calculation agrees well with its position in the photoemission experiments. This suggests that our dispersion captures the important physical mechanism of the dip phenomenon, an improved agreement with the experiments requires an improvement of the description of the FS.
22. We calculated ξ from the k-dependence of the spin-susceptibility at ω = 0 by neglecting vertex corrections of the particle hole bubble. Recently it was discussed [18] that this is a reasonable approximation which slightly overestimates the magnitude of the spin susceptibility.
23. y where the gap vanishes.
24. NC(T) of a model calculation without superconducting symmetry breaking (φ = 0).