重中子辐照MgB2样品的脱钉频率
Depinning frequency in a heavily neutron-irradiated MgB2 sample
摘要：
研究了中子辐照MgB_2样品的微波表面电阻随磁场的变化规律，中子辐照使MgB_2样品的两个带隙合并为一个带隙。在Coffey和Clem模型的框架下对实验结果进行了分析。通过对实验数据的拟合，我们确定了在不同温度下，退钉扎频率ω_0与场的关系。虽然钉扎不是特别有效，但在低温下获得的ω_0值明显高于在常规低温超导体中观察到的值。
英文摘要：
The magnetic-field-induced variations of the microwave surface resistance have been investigated in a heavily neutron-irradiated MgB2 sample, in which the irradiation has caused the merging of the two gaps into a single value. The experimental results have been analyzed in the framework of the Coffey and Clem model. By fitting the experimental data, we have determined the field dependence of the depinning frequency, omega_0, at different values of the temperature. Although the pinning is not particularly effective, the value of omega_0 obtained at low temperatures is considerably higher than that observed in conventional low-temperature superconductors.
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