STRONG DAMPING OF THE C-AXIS PLASMON IN HIGH-T-C CUPRATE SUPERCONDUCTORS

被引:55
作者
KIM, JH
SOMAL, HS
CZYZYK, MT
VANDERMAREL, D
WITTLIN, A
GERRITS, AM
DUIJN, VHM
HIEN, NT
MENOVSKY, AA
机构
[1] UNIV NIJMEGEN,HIGH FIELD MAGNET LAB,6525 ED NIJMEGEN,NETHERLANDS
[2] UNIV AMSTERDAM,VON DER WAALS ZEEMAN LAB,1018 XE AMSTERDAM,NETHERLANDS
来源
PHYSICA C | 1995年 / 247卷 / 3-4期
关键词
D O I
10.1016/0921-4534(95)00198-0
中图分类号
O59 [应用物理学];
学科分类号
摘要
We analyze the infrared reflectivity of La1.85Sr0.15CuO4 single crystals with E parallel to the c-axis. The plasma edge at around 6 meV (50 cm(-1)), which occurs only for T < T-c, is due to Cooper-pair tunneling. This low value of the plasma edge is shown to be consistent with the c-axis plasma frequency obtained from LDA band structure calculations (> 0.1 eV) if we take into account that the single-particle charge transport along the c-axis is strongly incoherent in the normal state, and remains so in the superconducting state. From a comparison of the optical conductivity with model calculations based on s- and d-wave weak-coupling theory in the dirty limit, we find no evidence for a reduction of the c-axis quasi-particle scattering rate below T-c. The c-axis scattering rate, the normal-state c-axis plasma frequency, and T-c obey h gamma > h nu(p) >> 3.5k(B)T(c), which is exactly opposite to the clean limit.
引用
收藏
页码:297 / 308
页数:12
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