论文标题
外部电磁辐射对TA薄膜异常金属行为的影响
Effect of external electromagnetic radiation on the anomalous metallic behaviors in Ta thin films
论文作者
论文摘要
我们研究了在RF辐射过滤器中具有三种构型的超导TA薄膜的运输特性。除了室温过滤器外，没有过滤器，只有室温过滤器和低温过滤器。过渡温度附近的运输特性在很大程度上取决于是否安装了室温过滤器。随着室温过滤器的加载层，整个过渡都转移到更高的温度。一旦在b = 0处达到零耐药状态，即使安装了低温过滤器，也不会观察到强大的辐射效应。当打开磁场时，在没有低温过滤器的情况下揭示了在低温下的非零抗性饱和度，这被认为是磁场诱导的量子金属相。但是，插入附加的低温滤光片会削弱电阻的饱和度，即金属行为的特征。该观察结果表明，先前报道的TA膜中的异常金属状态主要是由未过滤的辐射引起的，因此，如果存在，则固有的金属基态应限于临界点附近的狭窄磁场范围（如果存在）。
We investigated transport characteristics of superconducting Ta thin films with three configurations in rf radiation filters; no filter, only room-temperature filters, and low-temperature filters in addition to room-temperature filters. The transport properties near the transition temperature are strongly dependent on whether the room-temperature filter is installed or not. The entire transition is shifted to higher temperature with loading layers of the room-temperature filters. Once the zero-resistance state is achieved at B=0, no strong radiation effect is observed even with low-temperature filters installed. When magnetic field is turned on, the nonzero-resistance saturation at low temperatures is revealed without low-temperature filters, which has been considered to be magnetic-field-induced quantum metallic phase. However, the insertion of the additional low-temperature filter weakens the saturation of the resistance, the signature of the metallic behavior. This observation suggests that the previously reported anomalous metallic state in Ta films is mainly induced by the unfiltered radiation and, thus, the intrinsic metallic ground state should be limited to the narrow range of magnetic fields near the critical point, if exists.
