Naslov
SDW in cuprates - the role of oxygens

Autori
Nikšić, Goran ; Sunko, Denis ; Barišić, Slaven

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

Skup
XVII Training Course in the Physics of Strongly Correlated Systems

Mjesto i datum
Salerno, Italija; Vietri sul Mare, Italija, 01.10.2012. - 12.10.2012

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Nije recenziran

Ključne riječi
Superconductivity; stripes; LDA; phase transitions

Sažetak
We investigate the SDW susceptibility around the pseudogap temperature T* in a realistic three- band model of the CuO_2 planes in high-Tc cuprates. This approach starts from initially empty copper orbitals and metallic oxygen holes which then hybridise with the copper sites. The magnetic scattering of two oxygen holes in the hybridised ground state introduces k-dependent spectral weights and projectors which can lead to a suppression of the logarithmic singularity (commensurate SDW response) even at the van Hove doping, in the presence of even slight disorder. We find the three-band structure, site-selective scattering, and small amount of disorder to be the minimal elements of complexity which cumulatively enable the incommensurate SDW response to survive up to optimal doping without involving superconductivity. The supression of the commensurate response already at one-loop level corresponds to the crossover from the weak-coupling to the strong-coupling regime, characteristic of complex materials.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA