LABORATORY
CRYOGENIC TECHNOLOGY
HEAD: Assoc.Prof. Borislav Nikolov, Ph.D.
tel: 7144-540; e-mail: danski@issp.bas.bg
TOTAL STAFF: 8
RESEARCH SCIENTISTS: 3
Assoc.Prof. J.K.Georgiev, Ph.D
Assist.Prof. A.L.Zahariev, Ph.D.
RESEARCH ACTIVITIES:
NEW SUPERCONDUCTIVE MATERIALS
The effect of hole doping, on the transport and magnetic properties of Ca substituted
YBCO bulk samples, has been investigated. The existence of bulk pinning (established by
measurements of third harmonics of ac magnetic susceptibilities) and increasing of
critical current density is found for 30% Ca substitution.
Ag-sheathed Y1-xCaxBa2Cu3O7-y
superconducting tapes has been prepared by OPID method. The influence of temperature and
deformation treatment on the TC and JC of the tapes has been investigated.
ONGOING RESEARCH PROJECTS:
BAS budget financial support:
Investigation of weak links in the superconductive YBCO System in order to lower them
Head: Prof. Dr.Sc. V.T.Kovachev
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