Naslov
Hole Depletion of Ladders in Sr14Cu24O41 induced by Correlation Effects

Autori
Ilakovac, Vita ; Gougoussis, C. ; Calandra, M. ; Brookes, N.B. ; Bisogni, V. ; Chiuzbaian, S.G. ; Akimitsu, J. ; Milat, Ognjen ; Tomic, Silvia ; Hague C.F.

Izvornik
Physical Review B - Condensed Matter and Materials Physics (1098-0121) 85 (2012); 075108-1

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
spin ladders; correlation effects; NEXAFS; hole distribution

Sažetak
The hole distribution in Sr14Cu24 is studied by low-temperature polarization-dependent O K near-edge x-ray absorption fine-structure measurements and state-of-the-art electronic structure calculations that include core-hole and correlation effects in a mean-field approach. Contrary to all previous analysis, based on semiempirical models, we show that correlations and antiferromagnetic ordering favor the chain-hole attraction. For the remaining small number of holes accomodated on ladders, leg sites are preferred to rung sites. The small hole affinity of rung sites explains naturally the one-dimensional to two-dimensional crossover in the phase diagram of (la, Y, Sr, Ca)14Cu24O41.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA