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Kazim S, Sharma A, Yadav S, et al. Light Induced Electron-Phonon Scattering Mediated Resistive Switching in Nanostructured Nb Thin Film Superconductor. Sci Rep. 2017;7(1):881doi: 10.1038/s41598-017-00976-1.
Kazim, S., Sharma, A., Yadav, S., Gajar, B., Joshi, L. M., Mishra, M., Gupta, G., Husale, S., Gupta, A., Sahoo, S., & Ojha, V. N. (2017). Light Induced Electron-Phonon Scattering Mediated Resistive Switching in Nanostructured Nb Thin Film Superconductor. Scientific reports, 7(1), 881. https://doi.org/10.1038/s41598-017-00976-1
Kazim, Shafaq, et al. "Light Induced Electron-Phonon Scattering Mediated Resistive Switching in Nanostructured Nb Thin Film Superconductor." Scientific reports vol. 7,1 (2017): 881. doi: https://doi.org/10.1038/s41598-017-00976-1
Kazim S, Sharma A, Yadav S, Gajar B, Joshi LM, Mishra M, Gupta G, Husale S, Gupta A, Sahoo S, Ojha VN. Light Induced Electron-Phonon Scattering Mediated Resistive Switching in Nanostructured Nb Thin Film Superconductor. Sci Rep. 2017 Apr 13;7(1):881. doi: 10.1038/s41598-017-00976-1. PMID: 28408755; PMCID: PMC5429844.
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Sci Rep. 2017 Apr 13;7(1):881. doi: 10.1038/s41598-017-00976-1.

Light Induced Electron-Phonon Scattering Mediated Resistive Switching in Nanostructured Nb Thin Film Superconductor.

Scientific reports

Shafaq Kazim, Alka Sharma, Sachin Yadav, Bikash Gajar, Lalit M Joshi, Monu Mishra, Govind Gupta, Sudhir Husale, Anurag Gupta, Sangeeta Sahoo, V N Ojha

Affiliations

  1. Time & Frequency and Electrical & Electronics Metrology, National Physical Laboratory, Council of Scientific and Industrial Research, Dr. K. S Krishnan Road, New Delhi, 110012, India.
  2. Academy of Scientific and Innovative Research (AcSIR), National Physical Laboratory, Council of Scientific and Industrial Research, Dr. K. S Krishnan Road, New Delhi, 110012, India.
  3. Advanced Materials & Devices Division, National Physical Laboratory, Council of Scientific and Industrial Research, Dr. K. S Krishnan Road, New Delhi, 110012, India.
  4. Time & Frequency and Electrical & Electronics Metrology, National Physical Laboratory, Council of Scientific and Industrial Research, Dr. K. S Krishnan Road, New Delhi, 110012, India. [email protected].
  5. Academy of Scientific and Innovative Research (AcSIR), National Physical Laboratory, Council of Scientific and Industrial Research, Dr. K. S Krishnan Road, New Delhi, 110012, India. [email protected].

PMID: 28408755 PMCID: PMC5429844 DOI: 10.1038/s41598-017-00976-1

Abstract

The elemental Nb is mainly investigated for its eminent superconducting properties. In contrary, we report of a relatively unexplored property, namely, its superior optoelectronic property in reduced dimension. We demonstrate here that nanostructured Nb thin films (NNFs), under optical illumination, behave as room temperature photo-switches and exhibit bolometric features below its superconducting critical temperature. Both photo-switch and superconducting bolometric behavior are monitored by its resistance change with light in visible and near infrared (NIR) wavelength range. Unlike the conventional photodetectors, the NNF devices switch to higher resistive states with light and the corresponding resistivity change is studied with thickness and grain size variations. At low temperature in its superconducting state, the light exposure shifts the superconducting transition towards lower temperature. The room temperature photon sensing nature of the NNF is explained by the photon assisted electron-phonon scattering mechanism while the low temperature light response is mainly related to the heat generation which essentially changes the effective temperature for the device and the device is capable of sensing a temperature difference of few tens of milli-kelvins. The observed photo-response on the transport properties of NNFs can be very important for future superconducting photon detectors, bolometers and phase slip based device applications.

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