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Electrical Characteristics of Superconducting Ti Transition Edge Sensors

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Abstract

We have designed and fabricated superconducting Ti transition edge sensors (TES) with different microbridge lengths varying from 1 to 6 \(\upmu \)m. The current–voltage characteristics of the fabricated Ti TESs are measured at different bath temperatures using a commercial SQUID amplifier. The thermal conductance (G) is found to be about 300 pW/K for a 2.6-\(\upmu \)m-long device. In addition, the effective response time measured with a current pulse signal is about 3 \(\upmu \)s, and decreases with increasing the bias voltage because of negative electro-thermal feedback. The obtained electrical noise equivalent power from the measured current noise is about \(4 \times 10^{-17}\) W/Hz\(^{0.5}\), which is sufficiently low for TeSIA instrument.

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Acknowledgments

The authors would like to thank K. Zhang and F. Wu for their technical support. This work was supported in part by the NSFC under Grants 11127903, 11190012, 11222329, 11473075, CAS under Grant XDB04010300, and by the CAS Joint Key Lab for Radio Astronomy.

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Authors and Affiliations

  1. Purple Mountain Observatory, CAS, Nanjing, China

    W. Zhang, J. Q. Zhong, W. Miao, Z. Wang, D. Liu, Q. J. Yao & S. C. Shi

  2. Key Lab of Radio Astronomy, CAS, Nanjing, China

    W. Zhang, J. Q. Zhong, W. Miao, Z. Wang, D. Liu, Q. J. Yao & S. C. Shi

  3. Institute of Astronomy and Astrophysics, Academia Sinica, Taipei, Taiwan

    T. J. Chen & M. J. Wang

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  1. W. Zhang
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  2. J. Q. Zhong
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  9. M. J. Wang
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Correspondence to W. Zhang.

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Zhang, W., Zhong, J.Q., Miao, W. et al. Electrical Characteristics of Superconducting Ti Transition Edge Sensors. J Low Temp Phys 184, 11–16 (2016). https://doi.org/10.1007/s10909-015-1352-4

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  • DOI: https://doi.org/10.1007/s10909-015-1352-4

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