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我们利用激光沉积法在斜切的钛酸锶基片上制备了缺氧 (1 1 0 )取向的YBa2 Cu3 O7-δ薄膜 .由于在这种薄膜中的c轴躺在基片的表面上 ,从而为我们研究沿c方向的某些独特的物理性质提供了便利 .在这里我们报道了所测量的在不同温度及磁场下这种薄膜沿c方向的远红外偏振反射谱 .结果表明在温度Tc 以上 ,沿c方向运动的载流子浓度很低 .由于载流子之间弱的相干性以及较大的热涨落 ,反射边得到展宽 .随着超导的出现 ,沿着c方向运动的载流子之间的相干性得到加强 ,这表现为一个在 1 0 0波数附近等离子体边的出现 .磁场下的测量表明磁场对等离子体边的位置影响很小 ,这种现象与已有的理论预言不相符合 ,我们认为导致这种现象的原因是超导体中磁通涡旋的钉扎作用 .
We have prepared an oxygen-deficient (110) -oriented YBa2 Cu3 O7-δ thin film on a beveled strontium titanate substrate by laser deposition. Since the c axis in this thin film lies on the surface of the substrate, Provides us with convenience for studying some unique physical properties along the c-direction. Here we report the measured far-infrared polarization reflections of this film along the c-direction at different temperatures and magnetic fields. The results show that at temperatures above Tc , The concentration of carriers moving along the c direction is very low, and the reflection edge is broadened due to the weak coherence between the carriers and the large thermal fluctuations. With the advent of superconductivity, The coherence between the two fluids is enhanced by the appearance of a plasma edge near the wavenumber of 10. The measurements in the magnetic field show that the influence of the magnetic field on the edge of the plasma is very small, Prophecy does not match, we believe that the cause of this phenomenon is the superconductor flux vortex pinning effect.