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首页> 外文期刊>Philosophical magazine, B. Physics of condensed matter, electronic, optical, and magnetic properties >Microwave properties of YBa2CU3O7-delta films: magnetic-field-dependent order parameter fluctuations
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Microwave properties of YBa2CU3O7-delta films: magnetic-field-dependent order parameter fluctuations

机译：YBa2CU3O7-δ薄膜的微波特性：取决于磁场的阶跃参数波动

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We present measurements of the microwave resistivity in YBa2Cu3O7-delta films as a function of the temperature and magnetic field at 48 GHz above the critical temperature T-c. Even in moderate fields (up to 0.7 T) a noticeable magnetodissipation is observed; we attribute this to order parameter fluctuations. We find that Gaussian fluctuations are not consistent with the observed behaviour. Starting from the fact that the measurements taken in zero magnetic held can be quantitatively described in terms of the three-dimensional anisotropic renormalized fluctuations theory, we phenomenologically extend the theory by assuming that (to the first order in the magnetic field) the effects of renormalization reduce to the introduction of a temperature-dependent field scale. In this way we obtain a quantitative description of the experimental field-dependent microwave resistivity. [References: 19]
机译：我们提出YBa2Cu3O7-δ薄膜中微波电阻率的测量值，该温度是临界温度T-c上方48 GHz处温度和磁场的函数。即使在中等强度的磁场（高达0.7 T）下，也能观察到明显的磁化损耗。我们将其归因于参数波动。我们发现高斯波动与观察到的行为不一致。从可以用三维各向异性重归一化波动理论定量描述零磁保持下的测量这一事实开始，我们在现象学上通过假设重归一化的影响（在磁场中处于一阶）扩展了该理论。减少引入与温度有关的场标。通过这种方式，我们获得了与实验相关的微波电阻率的定量描述。 [参考：19]

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