Naslov
Suppression of the charge-density wave state in Sr14Cu24O41 by calcium doping

Autori
Vuletić, Tomislav ; Korin-Hamzić, Bojana ; Tomić, Silvia ; Gorshunov, Boris ; Haas, P. ; Room, T. ; Dressel, Martin ; Akimitsu J. ; Nagata T.

Izvornik
Physical Review Letters (0031-9007) 90 (2003); 257002 (1-4)

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

Ključne riječi
charge density wave; superconductivity; dielectric response; optical response

Sažetak
The charge response in the spin chain and/or ladder compound Sr 14 -x Ca x Cu 24 O 41 is characterized by dc resistivity, low-frequency dielectric spectroscopy and optical spectroscopy. We identify a phase transition below which a charge-density wave (CDW) develops in the ladder arrays. Calcium doping suppresses this phase with the transition temperature decreasing from 210 K for x= 0 to 10 K for x= 9 , and the CDWgap from 130 meV down to 3 meV, respectively. This suppression is due to the worsened nesting originating from the increase of the interladder tight-binding hopping integrals, as well as from disorder introduced at the Sr sites. These results altogether speak in favor of two-dimensional super-conductivity under pressure.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA