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Slightly underdoped high-Tc system La(1.86)Sr(0.14)CuO(4) (LSCO) is studiedby means of high energy high resolution angular resolved photoemissionspectroscopy (ARPES) and combined computational scheme LDA+DMFT+Sk.Corresponding one band Hubbard model is solved via dynamical mean-field theory(DMFT), while model parameters needed are obtained from first principles withinlocal density approximation (LDA). An "external" k-dependent self-energy Skdescribes interaction of correlated electrons with antiferromagnetic (AFM)pseudogap fluctuations. Experimental and theoretical data clearly show"destruction" of the LSCO Fermi surface in the vicinity of the (pi,0) point andformation of "Fermi arcs" in the nodal directions. ARPES energy distributioncurves (EDC) as well as momentum distribution curves (MDC) demonstratedeviation of the quasiparticle band from the Fermi level around (pi,0) point.The same behavior of spectral functions follows from theoretical calculationssuggesting AFM origin of the pseudogap state.

ARPES spectral functions and Fermi surface for La(1.86)Sr(0.14)CuO(4) compared with LDA+DMFT+Sk calculations