Naslov
Fermi Arc Evolution and Doping Mechanism in High-Temperature Superconductors

Autori
Sunko, Denis ; Pelc, Damjan ; Požek, Miroslav ; Despoja, Vito ; Lazić, Predrag

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
March Meeting 2015 / March Meeting 2015 Program Committee - : American Physical Society, 2015, 140-140

Skup
March Meeting of the American Physical Society

Mjesto i datum
San Antonio (TX), Sjedinjene Američke Države, 02.03.2015. - 06.03.2015

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
cuprates; pseudogap; zinc doping

Sažetak
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.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA