Naslov
Crossover in charge transport from one-dimensional copper-oxygen chains to two-dimensional ladders in (La, Y)(y)(Sr, Ca)(14-y)Cu24O41

Autori
Ivek, Tomislav ; Vuletić, Tomislav ; Korin-Hamzić, Bojana ; Milat, Ognjen ; Tomić, Silvia ; Gorshunov, Boris ; Dressel, Martin ; Akimitsu, J. ; Sugiyama, Y. ; Hess, C. ; Buechner, B.

Izvornik
Physical Review B - Condensed Matter and Materials Physics (1098-0121) 78 (2008), 20; 205105-1

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

Ključne riječi
spin chains; spin ladders; charge density wave; one-dimesnional hopping; dielectric relaxation

Sažetak
The charge transport in the copper-oxygen chain/ladder layers of \laysrca{; ; }; ; is investigated along two crystallographic directions in the temperature range from 50~K to 700~K and for doping levels from $y \approx 6$ (number of holes $n_h <1$) to $y = 0$ (number of holes $n_h = 6$). A crossover from a one-dimensional hopping transport along the chains for $y \geq 3$ to a quasi-two-dimensional charge conduction in the ladder planes for $y \lesssim 2$ is observed. This is attributed to a partial hole transfer from chains to ladders when the hole doping exceeds $n_h \approx 4$ and approaches fully doped value $n_h = 6$. For $y \lesssim 2$ a weak dielectric relaxation at radio-frequencies and a microwave mode are detected, which might be recognized as signatures of a charge-density wave phase developed at short length scales in the ladders planes.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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