Suppression of the charge-density-wave state in Sr14Cu24O41 by calcium doping.
Suppression of the charge-density-wave state in Sr14Cu24O41 by calcium doping.
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钙掺杂抑制 Sr14Cu24O41 中的电荷密度波态。
DOI：
10.1103/physrevlett.90.257002
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发表时间：
2003
影响因子：
8.6
通讯作者：
T. Nagata
中科院分区：
文献类型：
--
作者：
T. Vuletić;B. Korin;S. Tomić;B. Gorshunov;P. Haas;T. Rõõm;M. Dressel;J. Akimitsu;T. Sasaki;T. Nagata
在自旋链和/或梯形化合物Sr 14-xCaxCu 24 O 41的电荷响应的特征在于直流电阻率，低频介电谱和光谱。我们确定了一个相变低于一个电荷密度波（CDW）的梯形阵列中的发展。钙掺杂抑制这一阶段的转变温度从210 K（x=0）下降到10 K（x=9），CDW间隙从130 meV下降到3 meV，分别。这种抑制是由于恶化的嵌套源于梯间紧束缚跳跃积分的增加，以及从在Sr站点引入的障碍。这些结果共同支持了压力下的二维超导性。
The charge response in the spin chain and/or ladder compound Sr14-xCaxCu24O41 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 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.