▁In ▁super con duct ivity , ▁a ▁Joseph son ▁vor tex ▁( after ▁Brian ▁Joseph son ▁from ▁Cambridge ▁University ) ▁is ▁a ▁quantum ▁vor tex ▁of ▁super curr ents ▁in ▁a ▁Joseph son ▁j unction ▁( see ▁Joseph son ▁effect ). ▁The ▁super curr ents ▁circul ate ▁around ▁the ▁vor tex ▁center ▁which ▁is ▁situated ▁inside ▁the ▁Joseph son ▁bar rier , ▁unlike ▁Ab rik os ov ▁v ort ices ▁in ▁type - II ▁super con duct ors , ▁which ▁are ▁located ▁in ▁the ▁super con duct ing ▁cond ens ate . ▁ ▁Ab rik os ov ▁v ort ices ▁( after ▁Alex ei ▁Ab rik os ov ) ▁in ▁super con duct ors ▁are ▁character ized ▁by ▁normal ▁cores ▁where ▁the ▁super con duct ing ▁cond ens ate ▁is ▁destroyed ▁on ▁a ▁scale ▁of ▁the ▁super con duct ing ▁coh er ence ▁length ▁ ξ ▁( typ ically ▁ 5 - 1 0 0   nm ) ▁. ▁The ▁cores ▁of ▁Joseph son ▁v ort ices ▁are ▁more ▁complex ▁and ▁depend ▁on ▁the ▁physical ▁nature ▁of ▁the ▁bar rier . ▁In ▁Super con duct or - Normal ▁Metal - Super con duct or ▁( S NS ) ▁ ▁Joseph son ▁j unction s ▁there ▁exist ▁meas urable ▁super con duct ing ▁correl ations ▁induced ▁in ▁the ▁N - bar rier ▁by ▁proxim ity ▁effect ▁from ▁the ▁two ▁neighbour ing ▁super con duct ing ▁electro des . ▁Similarly ▁to ▁Ab rik os ov ▁v ort ices ▁in ▁super con duct ors , ▁Joseph