FREQUENCY AND TEMPERATURE-DEPENDENCE OF THE MILLIMETER-WAVE CONDUCTIVITY OF EPITAXIAL YBA2CU3O7 FILMS

被引:24
作者
DAHNE, U [1 ]
GONCHAROV, Y [1 ]
KLEIN, N [1 ]
TELLMANN, N [1 ]
KOZLOV, G [1 ]
URBAN, K [1 ]
机构
[1] MOSCOW GEN PHYS INST, MOSCOW 117942, RUSSIA
来源
JOURNAL OF SUPERCONDUCTIVITY | 1995年 / 8卷 / 01期
关键词
YBA2CU3O7; SUPERCONDUCTIVITY; MILLIMETER WAVE SPECTROSCOPY; DYNAMIC CONDUCTIVITY; SCATTERING RATE;
D O I
10.1007/BF00732254
中图分类号
O59 [应用物理学];
学科分类号
摘要
A millimeter wave spectrometer for frequencies between 100 and 350 GHz consisting of continuously tunable backward wave oscillators as sources and a quasioptical interferometer in the Mach-Zehnder configuration was used to measure the transmittivity in phase and amplitude of YBa2Cu3O7 thin films on NdGaO3 substrates. From the measured spectra we derived the real and imaginary part of the dynamic conductivity sigma = sigma(1) + i sigma(2) in the superconducting state as a function of temperature. The sigma(1)(T) and sigma(2)(T) values at 300 GHz were compared to corresponding values at 19 GHz determined by surface impedance measurements of the same films using a shielded dielectric resonator. Our observed frequency dependence of both sigma(1)(T) and sigma(2)(T) is consistent with a strong reduction of the quasiparticle scattering rate tau(-1)(T) with decreasing temperature below T-c.
引用
收藏
页码:129 / 134
页数:6
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