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Title: Effect of interstitial impurities on the field dependent microwave surface resistance of niobium

Abstract

Previous work has demonstrated that the radio frequency surface resistance of niobium resonators is dramatically reduced when nitrogen impurities are dissolved as interstitial in the material. This effect is attributed to the lowering of the Mattis-Bardeen surface resistance with increasing accelerating field; however, the microscopic origin of this phenomenon is poorly understood. Meanwhile, an enhancement of the sensitivity to trapped magnetic field is typically observed for such cavities. In this paper, we conduct a systematic study on these different components contributing to the total surface resistance as a function of different levels of dissolved nitrogen, in comparison with standard surface treatments for niobium resonators. Adding these results together, we are able to show which is the optimum surface treatment that maximizes the Q-factor of superconducting niobium resonators as a function of expected trapped magnetic field in the cavity walls. These results also provide insights on the physics behind the change in the field dependence of the Mattis-Bardeen surface resistance, and of the trapped magnetic vortex induced losses in superconducting niobium resonators.

Authors:
;  [1];  [2]; ; ; ; ;  [1];  [3]
  1. Fermi National Accelerator Laboratory, Batavia, Illinois 60510 (United States)
  2. (United States)
  3. Department of Physics, Illinois Institute of Technology, Chicago, Illinois 60616 (United States)
Publication Date:
OSTI Identifier:
22594353
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 109; Journal Issue: 6; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; COMPARATIVE EVALUATIONS; IMPURITIES; MAGNETIC FIELDS; MICROWAVE RADIATION; NIOBIUM; NITROGEN; RADIOWAVE RADIATION; RESONATORS; SENSITIVITY; SUPERCONDUCTING DEVICES; SURFACE TREATMENTS; SURFACES; TRAPPING; VORTICES; WALLS

Citation Formats

Martinello, M., E-mail: mmartine@fnal.gov, Checchin, M., Department of Physics, Illinois Institute of Technology, Chicago, Illinois 60616, Grassellino, A., Romanenko, A., Melnychuk, O., Sergatskov, D. A., Posen, S., and Zasadzinski, J. F.. Effect of interstitial impurities on the field dependent microwave surface resistance of niobium. United States: N. p., 2016. Web. doi:10.1063/1.4960801.
Martinello, M., E-mail: mmartine@fnal.gov, Checchin, M., Department of Physics, Illinois Institute of Technology, Chicago, Illinois 60616, Grassellino, A., Romanenko, A., Melnychuk, O., Sergatskov, D. A., Posen, S., & Zasadzinski, J. F.. Effect of interstitial impurities on the field dependent microwave surface resistance of niobium. United States. doi:10.1063/1.4960801.
Martinello, M., E-mail: mmartine@fnal.gov, Checchin, M., Department of Physics, Illinois Institute of Technology, Chicago, Illinois 60616, Grassellino, A., Romanenko, A., Melnychuk, O., Sergatskov, D. A., Posen, S., and Zasadzinski, J. F.. Mon . "Effect of interstitial impurities on the field dependent microwave surface resistance of niobium". United States. doi:10.1063/1.4960801.
@article{osti_22594353,
title = {Effect of interstitial impurities on the field dependent microwave surface resistance of niobium},
author = {Martinello, M., E-mail: mmartine@fnal.gov and Checchin, M. and Department of Physics, Illinois Institute of Technology, Chicago, Illinois 60616 and Grassellino, A. and Romanenko, A. and Melnychuk, O. and Sergatskov, D. A. and Posen, S. and Zasadzinski, J. F.},
abstractNote = {Previous work has demonstrated that the radio frequency surface resistance of niobium resonators is dramatically reduced when nitrogen impurities are dissolved as interstitial in the material. This effect is attributed to the lowering of the Mattis-Bardeen surface resistance with increasing accelerating field; however, the microscopic origin of this phenomenon is poorly understood. Meanwhile, an enhancement of the sensitivity to trapped magnetic field is typically observed for such cavities. In this paper, we conduct a systematic study on these different components contributing to the total surface resistance as a function of different levels of dissolved nitrogen, in comparison with standard surface treatments for niobium resonators. Adding these results together, we are able to show which is the optimum surface treatment that maximizes the Q-factor of superconducting niobium resonators as a function of expected trapped magnetic field in the cavity walls. These results also provide insights on the physics behind the change in the field dependence of the Mattis-Bardeen surface resistance, and of the trapped magnetic vortex induced losses in superconducting niobium resonators.},
doi = {10.1063/1.4960801},
journal = {Applied Physics Letters},
number = 6,
volume = 109,
place = {United States},
year = {Mon Aug 08 00:00:00 EDT 2016},
month = {Mon Aug 08 00:00:00 EDT 2016}
}
  • Previous work has demonstrated that the radio frequency surface resistance of niobium resonators is dramatically reduced when nitrogen impurities are dissolved as interstitial in the material. The origin of this effect is attributed to the lowering of the Mattis and Bardeen surface resistance contribution with increasing accelerating field. Meanwhile, an enhancement of the sensitivity to trapped magnetic field is typically observed for such cavities. In this paper we conduct the first systematic study on these different components contributing to the total surface resistance as a function of different levels of dissolved nitrogen, in comparison with standard surface treatments for niobiummore » resonators. Adding these results together we are able to show for the first time which is the optimum surface treatment that maximizes the Q-factor of superconducting niobium resonators as a function of expected trapped magnetic field in the cavity walls. Lastly, these results also provide new insights on the physics behind the change in the field dependence of the Mattis and Bardeen surface resistance, and of the trapped magnetic vortex induced losses in superconducting niobium resonators.« less
    Cited by 3
  • Previous work has demonstrated that the radio frequency surface resistance of niobium resonators is dramatically reduced when nitrogen impurities are dissolved as interstitial in the material. The origin of this effect is attributed to the lowering of the Mattis and Bardeen surface resistance contribution with increasing accelerating field. Meanwhile, an enhancement of the sensitivity to trapped magnetic field is typically observed for such cavities. In this paper we conduct the first systematic study on these different components contributing to the total surface resistance as a function of different levels of dissolved nitrogen, in comparison with standard surface treatments for niobiummore » resonators. Adding these results together we are able to show for the first time which is the optimum surface treatment that maximizes the Q-factor of superconducting niobium resonators as a function of expected trapped magnetic field in the cavity walls. Lastly, these results also provide new insights on the physics behind the change in the field dependence of the Mattis and Bardeen surface resistance, and of the trapped magnetic vortex induced losses in superconducting niobium resonators.« less
  • Cited by 3
  • Measurements of the quality factor, Q, of Nb superconducting microwave resonators often show that Q increases by {approx_equal} 10%–30% with increasing radio-frequency (rf) field, H, up to {approx} 15-20 mT. Recent high temperature heat treatments can amplify this rf field-induced increase of Q up to {approx_equal} 50%–100% and extend it to much higher fields, but the mechanisms of the enhancement of Q(H) remain unclear. Here, we suggest a method to reveal these mechanisms by measuring temperature dependencies of Q at different rf field amplitudes. We show that the increase of Q(H) does not come from a field dependent quasi-particles activationmore » energy or residual resistance, but rather results from the smearing of the density of state by the rf field.« less