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MgB2 HEB Mixers at Operation Temperatures above Liquid Helium Temperature

Evgenii Novoselov (Institutionen för mikroteknologi och nanovetenskap, Terahertz- och millimetervågsteknik ) ; Naichuan M. Zhang (Institutionen för mikroteknologi och nanovetenskap) ; Sergey Cherednichenko (Institutionen för mikroteknologi och nanovetenskap, Terahertz- och millimetervågsteknik )
27th International Symposium on Space Terahertz Technology April 12-15, 2016, Nanjing, China (2016)
[Konferensbidrag, refereegranskat]

In this paper we discuss results of MgB2 thin films deposition for the hot-electron bolometer (HEB) application. For this purpose a custom made hybrid physical-chemical vapour deposition (HPCVD) system was built. For films thicknesses d in the 15-45nm range the critical temperatures were from 34K to 40K. For bridges as narrow as 500nm the critical current density was >107A/cm2 indicating a high film quality. The intermediate frequency (IF) gain bandwidth (GBW) was measured at 0.4THz at various temperatures and bias points. The GBW follows the 1/d trend and is at least 6GHz for the 15nm thick sample.

Nyckelord: MgB2, hot-electron bolometer, terahertz, HPCVD, superconductivity

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Denna post skapades 2017-01-10. Senast ändrad 2017-01-27.
CPL Pubid: 246747