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Pregled bibliografske jedinice broj: 755349

Zbornik radova

Autori: Sunko, Denis; Pelc, Damjan; Požek, Miroslav; Despoja, Vito; Lazić, Predrag
Naslov: Fermi Arc Evolution and Doping Mechanism in High-Temperature Superconductors
Izvornik: March Meeting 2015 / March Meeting 2015 Program Committee (ur.). - American Physical Society , 2015. 140-140.
Skup: March Meeting of the American Physical Society
Mjesto i datum: San Antonio, Sjedinjene Države, 02-06.03.2015
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.
Vrsta sudjelovanja: Predavanje
Vrsta prezentacije u zborniku: Sažetak
Vrsta recenzije: Međunarodna recenzija
Izvorni jezik: ENG
Kategorija: Znanstveni
Znanstvena područja:
Fizika
Upisao u CROSBI: Denis Sunko (dks@phy.hr), 15. Ožu. 2015. u 18:37 sati



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