Pregled bibliografske jedinice broj: 715115
Effects of Sr and Zn doping on the metallicity and superconductivity of LSCO and YBCO
Effects of Sr and Zn doping on the metallicity and superconductivity of LSCO and YBCO // Journal of superconductivity and novel magnetism, 28 (2015), 4; 1299-1303 doi:10.1007/s10948-014-2909-1 (međunarodna recenzija, članak, znanstveni)
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Naslov
Effects of Sr and Zn doping on the metallicity and superconductivity of LSCO and YBCO
Autori
Lazić, Predrag ; Pelc, Damjan ; Požek, Miroslav ; Despoja, Vito ; Sunko, Denis
Izvornik
Journal of superconductivity and novel magnetism (1557-1939) 28
(2015), 4;
1299-1303
Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni
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.
Izvorni jezik
Engleski
Znanstvena područja
Fizika
Napomena
Plenarno predavanje na konferenciji Superstripes 2014 ; Erice, Italija, 25.-31.07.2014.
POVEZANOST RADA
Projekti:
119-1191458-0512 - Niskodimenzionalni jako korelirani vodljivi sustavi (Barišić, Slaven, MZOS ) ( CroRIS)
Ustanove:
Institut "Ruđer Bošković", Zagreb,
Prirodoslovno-matematički fakultet, Zagreb
Profili:
Predrag Lazić
(autor)
Miroslav Požek
(autor)
Vito Despoja
(autor)
Damjan Pelc
(autor)
Denis Sunko
(autor)
Citiraj ovu publikaciju:
Časopis indeksira:
- Current Contents Connect (CCC)
- Web of Science Core Collection (WoSCC)
- Science Citation Index Expanded (SCI-EXP)
- SCI-EXP, SSCI i/ili A&HCI
- Scopus
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