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Structural and Electrical Characteristics of Pb(Zr0.53,Ti0.47)O3 Thin Films Deposited on Si (100) Substrates 总被引:1,自引:0,他引:1 下载免费PDF全文
Pb(Zr0.53, Ti0.47)O3 (PZT) films were directly deposited on Si substrates without a buffer layer by pulsed laser deposition. Only(110)-oriented PZT peaks (other than Si substrate peaks) were observed from the XRD data. The electrical properties of the PZT/Si capacitor were characterized in terms of both the capacitance versus voltage (C-V) and current versus voltage (I-V) measurements. The clockwise trace of the C-V curve shows ferroelectric polarization switching, as is expected. From the I-V curves, the Schottky emission and spacecharge-limited-current behaviour are found to be the mainly leakage current mechanism in a certain electric field range in the negative and positive bias, respectively. 相似文献
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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(110)取向的YBa2Cu3O7-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100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. 相似文献
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Nanosecond-time-resolved infrared spectroscopic study of fast relaxation kinetics of protein folding by means of laser-induced temperature-jump 下载免费PDF全文
Elucidating the initial kinetics of folding pathways is critical to the understanding of the protein folding mechanism. Transient infrared spectroscopy has proved a powerful tool to probe the folding kinetics. Herein we report the construction of a nanosecond laser-induced temperature-jump (T-jump) technique coupled to a nanosecond timeresolved transient mid-infrared (mid-IR) spectrometer system capable of investigating the protein folding kinetics with a temporal resolution of 50 ns after deconvolution of the instrumental response function. The mid-IR source is a liquid N2 cooled CO laser covering a spectral range of 5.0μm (2000 cm^-1)-6.5μm (1540 cm^-1). The heating pulse was generated by a high pressure H2 Raman shifter at wavelength of 1.9μm. The maximum temperature-jump could reach as high as 26±1℃. The fast folding/unfolding dynamics of cytochrome C was investigated by the constructed system, providing an example. 相似文献
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This paper reports that polarized far-infrared reflectivity measurements have been done on LiGaO2 single crystal along two crystalline taxes at different temperatures. The temperature dependent frequencies of the longitudinal and transverse optical phonon have been obtained from the real part of optical conductivity and the loss function respectively. A small Drude component is observed at frequency below 300 cm^-1 which could arise from Li ions or oxygen deficiencies. The ionicity of LiGaO2 has been studied from the analysis of the Born effective charge of different ions. 相似文献
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我们发现高超导转变温度Tc(23K)的溅射Nb-Ge膜,都含有一定量的Nb5Ge3相,且Nb/Ge<3。对一般样品,用感应法所测的Tc都低于电阻法所测结果约1—2K,Tc≥22K的量在样品中所占的比例相对来说都比较小。对于只含A15相的薄膜,更显示出具有几个台阶宽的转变曲线,高Tc相含量很少;而对于含有A15相和一定量Nb5Ge3相的薄膜,感应法测量结果是一个较陡且光滑的转变曲线。电子显微镜观察呈现出Nb5Ge3和A15相的有趣的分布。这些结果对于我们以前提出的Nb5Ge3相对高TcA15相有稳定作用的观点是一个进一步的证明。 相似文献
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文章简要介绍了高温超导体中的相分离现象及其研究现状,同时报道了作者对La2CuO4体系中的相分离及电荷有序现象的研究工作. 相似文献
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