Author: Beverstock, D.R.
Paper Title Page
MOPMB083 Investigation of the Multilayer Shielding Effect through NbTiN-AlN Coated Bulk Niobium 311
SUSPB025   use link to see paper's listing under its alternate paper code  
 
  • I.H. Senevirathne, J.R. Delayen, A.V. Gurevich
    ODU, Norfolk, Virginia, USA
  • D.R. Beverstock, J.R. Delayen, A-M. Valente-Feliciano
    JLab, Newport News, Virginia, USA
  • D.R. Beverstock
    The College of William and Mary, Williamsburg, Virginia, USA
  
  We re­port mea­sure­ments of the dc field onset Bp of mag­netic flux pen­e­tra­tion through NbTiN-AlN coat­ing on bulk nio­bium using the Hall probe ex­per­i­men­tal setup. The mea­sure­ments of Bp re­veal the mul­ti­layer shield­ing ef­fect on bulk nio­bium under high mag­netic fields at cryo­genic tem­per­a­tures. We ob­served a sig­nif­i­cant en­hance­ment in Bp for the NbTiN-AlN coated Nb sam­ples as com­pared to bare Nb sam­ples. The ob­served de­pen­dence of Bp on the coat­ing thick­ness is con­sis­tent with the­o­ret­i­cal pre­dic­tions.  
DOI • reference for this paper ※ doi:10.18429/JACoW-SRF2023-MOPMB083  
About • Received ※ 18 June 2023 — Revised ※ 22 June 2023 — Accepted ※ 27 June 2023 — Issue date ※ 12 August 2023
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WEIXA01
 Experimental Evidence for Current Suppression in Superconducting Hetero Structures  
 
  • M. Asaduzzaman, T. Junginger, R.M.L. McFadden
    UVIC, Victoria, Canada
  • D.R. Beverstock, A-M. Valente-Feliciano
    JLab, Newport News, Virginia, USA
  • T. Junginger, R.M.L. McFadden
    TRIUMF, Vancouver, Canada
  • T. Prokscha, Z. Salman, A. Suter
    PSI, Villigen PSI, Switzerland
  
  Coat­ing Nb with thin lay­ers of su­per­con­duc­tors of higher pen­e­tra­tion depth, than Nb have been pro­posed as a means of ob­tain­ing ac­cel­er­at­ing gra­di­ents (Eacc) of be­yond Nb’s fun­da­men­tal limit. Such het­erostruc­tures (which can also con­tain in­su­lat­ing lay­ers be­tween the su­per­con­duc­tors) can po­ten­tially sus­tain their Meiss­ner state above the su­per­heat­ing field, Bsh (of all the lay­ers) due to the sup­pres­sion of the Meiss­ner screen­ing cur­rent in the sur­face layer(s) in­duced by a counter-cur­rent in the sub­strate layer. We re­port ev­i­dence for counter-cur­rent flow in su­per­con­duc­tor- su­per­con­duc­tor (SS) Nb-Ti-N/Nb sam­ples from depth-re­solved mea­sure­ments of their Meiss­ner screen­ing pro­files at ap­plied fields below or equal to 25 mT using the low en­ergy muon spin ro­ta­tion (LE-muSR) tech­nique. Fits to the Lon­don model with ap­pro­pri­ate bound­ary and con­ti­nu­ity con­di­tions de­ter­mine the pen­e­tra­tion depth of the Nb-Ti-N lay­ers to be 182.5(31) nm in good agree­ment with lit­er­a­ture val­ues. Our re­sults sug­gest that due to the strong sup­pres­sion of the Meiss­ner cur­rents in the sur­face layer, mul­ti­lay­ered struc­tures of sev­eral su­per­con­duct­ing and in­su­lat­ing lay­ers are nec­es­sary to reach high­est Eacc.
An electronic pre-print is available at https://arxiv.org/abs/2304.09360 		 
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