Molybdenum-rhenium alloy based high- Q superconducting microwave resonators

• Published in: Applied physics letters 2014-12, Vol.105 (22)
• Main Authors: Singh, Vibhor, Schneider, Ben H., Bosman, Sal J., Merkx, Evert P. J., Steele, Gary A.
• Format: Article
• Language: English
• Subjects: Applied physics; CARBON NANOTUBES; CHEMICAL VAPOR DEPOSITION; CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; DIELECTRIC MATERIALS; FABRICATION; Hybrid systems; MAGNETIC FIELDS; MICROWAVE EQUIPMENT; Molybdenum; MOLYBDENUM ALLOYS; Organic chemistry; QUALITY FACTOR; RESONATORS; Rhenium; RHENIUM ALLOYS; Rhenium base alloys; Substrates; Superconductivity; Temperature; Temperature dependence; TRANSITION TEMPERATURE
• ISSN: 0003-6951; 1077-3118
• DOI: 10.1063/1.4903042

Superconducting microwave resonators (SMRs) with high quality factors have become an important technology in a wide range of applications. Molybdenum-Rhenium (MoRe) is a disordered superconducting alloy with a noble surface chemistry and a relatively high transition temperature. These properties make it attractive for SMR applications, but characterization of MoRe SMR has not yet been reported. Here, we present the fabrication and characterization of SMR fabricated with a MoRe 60–40 alloy. At low drive powers, we observe internal quality-factors as high as 700 000. Temperature and power dependence of the internal quality-factors suggest the presence of the two level systems from the dielectric substrate dominating the internal loss at low temperatures. We further test the compatibility of these resonators with high temperature processes, such as for carbon nanotube chemical vapor deposition growth, and their performance in the magnetic field, an important characterization for hybrid systems.