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Pregled bibliografske jedinice broj: 715115

Časopis

Autori: Lazić, Predrag; Pelc, Damjan; Požek, Miroslav; Despoja, Vito; Sunko, Denis
Naslov: Effects of Sr and Zn doping on the metallicity and superconductivity of LSCO and YBCO
Izvornik: Journal of superconductivity and novel magnetism (1557-1939) 28 (2015), 4; 1299-1303
Vrsta rada: članak
Ključne riječi: high-temperature superconductors; doping; NQR; DFT
Sažetak:
Sr doping in La2CuO4 is investigated by a Kohn-Sham DFT+U calculation. We confirm earlier calculations finding that the Sr charge remains highly localized. The bulk of the charge observed in ARPES is delocalized in situ in the CuO2 plane. We find that a selective shift of the vH singularity in energy, accounting for the failure of the rigid-band picture, is a dielectric effect of doping. We show that Kohn-Sham DFT+U reproduces the observed Fermi-surface arcs, when not restricted to the paramagnetic solution space. Substituting planar Cu by isotopically pure 67Zn in YBCO, we measure the NQR signal on the Zn site itself for the first time. We find that Zn creates large insulating islands, extending at least to the nearest-neighbor Cu site, thus confirming that doping induces an orbital delocalization transition in the plane, which is locally reversed by Zn substitution. Calculations show that the D4 symmetry-breaking observed in NQR is due to the same partial lifting of degeneracy of the nearest-neighbor oxygen sites as in the LTT transition in LSCO.
Projekt / tema: 119-1191458-0512
Izvorni jezik: ENG
Rad je indeksiran u
bazama podataka:
Current Contents Connect (CCC)
Scopus
SCI-EXP, SSCI i/ili A&HCI
Science Citation Index Expanded (SCI-EXP) (sastavni dio Web of Science Core Collectiona)
Kategorija: Znanstveni
Znanstvena područja:
Fizika
URL Internet adrese: http://link.springer.com/article/10.1007/s10948-014-2909-1
Broj citata:
Altmetric:
DOI: 10.1007/s10948-014-2909-1
URL cjelovitog teksta:
Google Scholar: Effects of Sr and Zn doping on the metallicity and superconductivity of LSCO and YBCO
Upisao u CROSBI: Denis Sunko (dks@phy.hr), 15. Ruj. 2014. u 12:50 sati
Napomene:
Plenarno predavanje na konferenciji Superstripes 2014 ; Erice, Italija, 25.-31.07.2014.



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