Josephson plasma resonance observed in Tl/sub 2/Ba/sub 2/CaCu/sub 2/O/sub 8/ superconducting thin films using terahertz time-domain spectroscopy

V. Thorsmølle, R. Averitt, M. Maley, A. Taylor, L. Bulaevskii, C. Helm
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Abstract

Summary form only given. The c-axis Josephson plasma resonance (JPR) in highly anisotropic layered cuprate superconductors originates from the interlayer tunneling of Cooper pairs. The JPR, /spl omega//sub pc/=c//spl lambda//sub c//spl radic/(/spl epsi//sub /spl infin///sup c/) is directly related to the London penetration depth along the c-axis, /spl lambda//sub c/, and is thus a fundamental probe of the superconducting state and an excellent tool to study these highly anisotropic systems. /spl epsi//sub /spl infin///sup c/ is the high frequency dielectric constant along the c-axis. For T/spl Lt/T/sub c/, the temperature dependence of /spl lambda//sub c/ is related to the symmetry of the order parameter. For T close to T. the appearance of the JPR probes the onset of interlayer phase coherence. Furthermore, the JPR spectral width is a measure of the quasiparticle scattering rate. In a magnetic field, the JPR probes the correlation of pancake vortices along the c-axis and is a tool to study the B-T phase diagram. The JPR of high-T/sub c/ superconductors with extreme anisotropy such as the bismuth, thallium, and mercury based high-T/sub c/ superconductors lies in the far-infrared and is thus amenable to study using terahertz time-domain spectroscopy (THz-TDS). We have measured the JPR in Tl/sub 2/Ba/sub 2/CaCu/sub 2/O/sub 8/ superconducting thin films employing THz-TDS in transmission.
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用太赫兹时域光谱法观察了Tl/sub 2/Ba/sub 2/CaCu/sub 2/O/sub 8/超导薄膜中的Josephson等离子体共振
只提供摘要形式。高各向异性层状铜超导体中的c轴约瑟夫森等离子体共振(JPR)是由库珀对的层间隧穿引起的。JPR /spl omega//sub pc/=c//spl lambda//sub c//spl radic/(/spl epsi//sub /spl infin///sup c/)与沿c轴的伦敦穿透深度/spl lambda//sub c/直接相关,是超导态的基本探测,是研究这些高各向异性体系的良好工具。/spl epsi//sub /spl infin///sup c/为沿c轴的高频介电常数。对于T/spl Lt/T/下标c/, /spl λ //下标c/的温度依赖性与序参量的对称性有关。当T接近T时,JPR的出现探测了层间相位相干的开始。此外,JPR光谱宽度是准粒子散射率的量度。在磁场中,JPR探测沿c轴的煎饼涡的相关性,是研究B-T相图的工具。具有极端各向异性的高t /sub - c/超导体,如铋、铊和汞基高t /sub - c/超导体的JPR位于远红外,因此可以使用太赫兹时域光谱(THz-TDS)进行研究。我们用太赫兹tds测量了Tl/sub 2/Ba/sub 2/CaCu/sub 2/O/sub 8/超导薄膜的JPR。
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