Lumped element kinetic inductance detectors based on two-gap MgB2 thin films
| Autor: | Zhengshan Guo, Yijiao Wang, H. M. Chu, Qingrong Feng, X. W. Cai, Cheng‐Qing Yang, Ruirui Niu, K. Yang, Z. Z. Gan |
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| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Superconductivity Materials science Physics and Astronomy (miscellaneous) business.industry Band gap Terahertz radiation 01 natural sciences 0103 physical sciences Optoelectronics RLC circuit Millimeter Thin film 010306 general physics business Type-II superconductor Microwave |
| Zdroj: | Applied Physics Letters. 112:022601 |
| ISSN: | 1077-3118 0003-6951 |
| DOI: | 10.1063/1.5013286 |
| Popis: | Lumped element kinetic inductance detectors (LEKIDs) are made from a single layer superconducting thin film. Because of their low noise and highly multiplexibility, LEKIDs provide a sensitive technology for the detection of millimeter and submillimeter waves. In this work, a 5-pixel 50-nm-thick MgB2 array is made. The microwave properties of the array are measured under dark conditions. We show that the loaded quality factor Q of the resonant circuit is 30 000 at 7.5 K, which is comparable to that of lower-operating-temperature (usually several hundred mK) LEKIDs made from superconductors such as Al and Nb. Moreover, the temperature dependence of resonance frequency gives the two-gap character of MgB2, Δπ (0) = 2.58 meV and Δσ (0) = 8.26 meV. The gap frequency (f = 2Δ/h) indicates that MgB2 LEKIDs have a promising application on terahertz detection. |
| Databáze: | OpenAIRE |
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