Absence of a loss of in-plane infrared spectral weight in the pseudogap regime of Bi(2)Sr(2)CaCu(2)O(8+delta).
Absence of a loss of in-plane infrared spectral weight in the pseudogap regime of Bi(2)Sr(2)CaCu(2)O(8+delta).
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Bi(2)Sr(2)CaCu(2)O(8 delta)赝能隙区域内面内红外光谱权重不存在损失。
DOI：
10.1103/physrevlett.88.097005
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发表时间：
2002
影响因子：
8.6
通讯作者：
H. Raffy
中科院分区：
文献类型：
--
作者：
A. Santander;Ricardo P. S. M. Lobo;N. Bontemps;Z. Konstantinović;Z. Li;H. Raffy
Bi(2)Sr(2)CaCu(2)O(8+delta) (Bi-2212) 薄膜的 ab 平面反射率在 30-25 000 cm(-1) 范围内测量，其中一种欠掺杂 (T(c) = 70 K) 和一种过掺杂样品 (T(c) = 63 K) 低至 10 K。我们发现两种样品的正常态红外响应的温度依赖性具有相似的行为。在 T(c) 以上，当 T 减小时，从积分电导率获得的有效光谱权重不会减小，因此不会看到光学赝能隙的开口。我们认为这些是 k = (0,pi) 方向上的赝能隙开口以及面内红外电导率对 k = (pi,pi) 方向最敏感的结果。
The ab-plane reflectance of Bi(2)Sr(2)CaCu(2)O(8+delta) (Bi-2212) thin films was measured in the 30-25 000 cm(-1) range for one underdoped ( T(c) = 70 K), and one overdoped sample ( T(c) = 63 K) down to 10 K. We find similar behaviors in the temperature dependence of the normal-state infrared response of both samples. Above T(c), the effective spectral weight, obtained from the integrated conductivity, does not decrease when T decreases, so that no opening of an optical pseudogap is seen. We suggest that these are consequences of the pseudogap opening in the k = (0,pi) direction and of the in-plane infrared conductivity being mostly sensitive to the k = (pi,pi) direction.