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Fermi arcs and pseudogap emerging from dimensional crossover at the Fermi surface in La2-xSrxCuO4 (CROSBI ID 208961)

Prilog u časopisu | Pismo (znanstveno) | međunarodna recenzija

Lazić, Predrag ; Sunko, Denis Fermi arcs and pseudogap emerging from dimensional crossover at the Fermi surface in La2-xSrxCuO4 // Europhysics letters, 112 (2015), 37011-1-37011-6. doi: 10.1209/0295-5075/112/37011

Podaci o odgovornosti

Lazić, Predrag ; Sunko, Denis

engleski

Fermi arcs and pseudogap emerging from dimensional crossover at the Fermi surface in La2-xSrxCuO4

The doping mechanism and realistic Fermi surface (FS) evolution of La$_{; ; 2-x}; ; $Sr$_x$CuO$_4$ (LSCO) are modelled within an extensive ab-initio framework including advanced band-unfolding techniques. We show that ordinary Kohn-Sham DFT+U can reproduce the observed metal-insulator transition, when not restricted to the paramagnetic solution space. Arcs are self-doped by orbital charge transfer within the Cu--O planes, while the introduced Sr charge is strongly localized. Arc protection and the inadequacy of the rigid-band picture are consequences of a rapid change in orbital symmetry at the Fermi energy: the material undergoes a dimensional crossover along the Fermi surface, between the nodal (2D) and antinodal (3D) regions. In LSCO, this crossover accounts for FS arcs, the antinodal pseudogap, and insulating behavior in $c$-axis conductivity, all ubiquitous phenomena in high-T$_c$ cuprates. Ligand Coulomb integrals involving out-of-plane sites are principally responsible for the most striking ffects observed by ARPES in LSCO.

high-temperature superconductors; doping; ARPES; DFT

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Podaci o izdanju

112

2015.

37011-1-37011-6

objavljeno

0295-5075

10.1209/0295-5075/112/37011

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Fizika

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