TY - JOUR
T1 - Nonmonotonic low frequency losses in HTSCs
AU - Castro, H.
AU - Gerber, A.
AU - Milner, A.
PY - 2007/7/1
Y1 - 2007/7/1
N2 - A calorimetric technique has been used in order to study ac-field dissipation in ceramic BSCCO samples at low frequencies between 0.05 and 250Hz, at temperatures from 65 to 90K. In contrast to previous studies, where aclosses have been reported with a linear dependence on magnetic field frequency, we find a nonmonotonic function presenting various maxima. Frequencies corresponding to local maxima of dissipation depend on the temperature and the amplitude of the ac magnetic field. Flux creep is argued to be responsible for this behaviour. A simple model connecting the characteristic vortex relaxation times (flux creep) and the location of dissipation maxima versus frequency is proposed.
AB - A calorimetric technique has been used in order to study ac-field dissipation in ceramic BSCCO samples at low frequencies between 0.05 and 250Hz, at temperatures from 65 to 90K. In contrast to previous studies, where aclosses have been reported with a linear dependence on magnetic field frequency, we find a nonmonotonic function presenting various maxima. Frequencies corresponding to local maxima of dissipation depend on the temperature and the amplitude of the ac magnetic field. Flux creep is argued to be responsible for this behaviour. A simple model connecting the characteristic vortex relaxation times (flux creep) and the location of dissipation maxima versus frequency is proposed.
UR - http://www.scopus.com/inward/record.url?scp=34250657041&partnerID=8YFLogxK
U2 - 10.1088/0953-2048/20/7/002
DO - 10.1088/0953-2048/20/7/002
M3 - ???researchoutput.researchoutputtypes.contributiontojournal.article???
AN - SCOPUS:34250657041
SN - 0953-2048
VL - 20
SP - 592
EP - 600
JO - Superconductor Science and Technology
JF - Superconductor Science and Technology
IS - 7
M1 - 002
ER -