Fermi Arc Evolution and Doping Mechanism in High-Temperature Superconductors (CROSBI ID 622666)
Prilog sa skupa u zborniku | sažetak izlaganja sa skupa | međunarodna recenzija
Podaci o odgovornosti
Sunko, Denis ; Pelc, Damjan ; Požek, Miroslav ; Despoja, Vito ; Lazić, Predrag
engleski
Fermi Arc Evolution and Doping Mechanism in High-Temperature Superconductors
We calculate realistic Fermi surface (FS) evolution of La2−xSrxCuO4 (LSCO) with Sr doping 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 and arc growth, when not restricted to the paramagnetic solution space. We elucidate both arc protection and the inadequacy of the rigid-band picture as 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 and the antinodal pseudogap, otherwise ubiquitous phenomena in high-Tc cuprates. The orbital transition is experimentally confirmed by replacing 4\% of planar Cu in nearly optimally doped YBa2Cu2.97Zn0.03O6.92 powder with 67Zn isotope, lowering Tc to 57 K. The NQR spectrum of 67Zn, measured for the first time, shows that each Zn dopand surrounds itself with an insulating cluster. Zn destroys the SC metal by a Coulomb ``domino effect'' which reverts the orbital transition locally and pushes a significant number of surrounding sites back towards the parent-compound configuration.
cuprates; pseudogap; zinc doping
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Podaci o prilogu
140-140.
2015.
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objavljeno
Podaci o matičnoj publikaciji
March Meeting 2015
March Meeting 2015 Program Committee
American Physical Society
Podaci o skupu
March Meeting of the American Physical Society
predavanje
02.03.2015-06.03.2015
San Antonio (TX), Sjedinjene Američke Države