TY - JOUR
T1 - Crossover in charge transport from one-dimensional copper-oxygen chains to two-dimensional ladders in (La,Y)y(Sr,Ca)14-yCu 24O41
AU - Ivek, T.
AU - Vuletić, T.
AU - Korin-Hamzić, B.
AU - Milat, O.
AU - Tomić, S.
AU - Gorshunov, B.
AU - Dressel, M.
AU - Akimitsu, J.
AU - Sugiyama, Y.
AU - Hess, C.
AU - Büchner, B.
PY - 2008/11/7
Y1 - 2008/11/7
N2 - The charge transport in the copper-oxygen chain/ladder layers of (La,Y) y (Sr,Ca) 14-y Cu24 O41 is investigated along two crystallographic directions in the temperature range from 50 to 700 K and for doping levels from y≈6 (number of holes nh <1) to y=0 (number of holes nh =6). A crossover from a one-dimensional hopping transport along the chains for y≥3 to a quasi-two-dimensional charge conduction in the ladder planes for y≲2 is observed. This is attributed to a partial hole transfer from chains to ladders when the hole doping exceeds nh ≈ 4 and approaches fully doped value nh =6. For y≲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 ladder planes.
AB - The charge transport in the copper-oxygen chain/ladder layers of (La,Y) y (Sr,Ca) 14-y Cu24 O41 is investigated along two crystallographic directions in the temperature range from 50 to 700 K and for doping levels from y≈6 (number of holes nh <1) to y=0 (number of holes nh =6). A crossover from a one-dimensional hopping transport along the chains for y≥3 to a quasi-two-dimensional charge conduction in the ladder planes for y≲2 is observed. This is attributed to a partial hole transfer from chains to ladders when the hole doping exceeds nh ≈ 4 and approaches fully doped value nh =6. For y≲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 ladder planes.
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U2 - 10.1103/PhysRevB.78.205105
DO - 10.1103/PhysRevB.78.205105
M3 - Article
AN - SCOPUS:56349128197
VL - 78
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
SN - 1098-0121
IS - 20
M1 - 205105
ER -