TY - JOUR
T1 - Suppression of the Charge-Density-Wave State in [Formula presented] by Calcium Doping
AU - Vuletić, T.
AU - Korin-Hamzić, B.
AU - Tomić, S.
AU - Gorshunov, B.
AU - Haas, P.
AU - Rõõm, T.
AU - Dressel, M.
AU - Akimitsu, J.
AU - Sasaki, T.
AU - Nagata, T.
PY - 2003
Y1 - 2003
N2 - The charge response in the spin chain and/or ladder compound [Formula presented] 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 [Formula presented] to 10 K for [Formula presented], and the CDW gap 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 superconductivity under pressure.
AB - The charge response in the spin chain and/or ladder compound [Formula presented] 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 [Formula presented] to 10 K for [Formula presented], and the CDW gap 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 superconductivity under pressure.
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U2 - 10.1103/PhysRevLett.90.257002
DO - 10.1103/PhysRevLett.90.257002
M3 - Article
AN - SCOPUS:85038271147
VL - 90
SP - 4
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
IS - 25
ER -