TY - JOUR
T1 - Origin of the fast magnetization relaxation at low temperatures in HTS with strong pinning
AU - Miu, L.
AU - Ivan, I.
AU - Badica, P.
AU - Jakob, G.
AU - Miu, D.
AU - Mele, Paolo
AU - Matsumoto, K.
AU - Mukaida, M.
AU - Yoshida, Y.
AU - Horide, T.
AU - Ichinose, A.
AU - Horii, S.
PY - 2010/11/1
Y1 - 2010/11/1
N2 - The temperature T variation of the normalized magnetization relaxation rate S in high-temperature superconductors (HTS) with strong vortex pinning exhibits a maximum in the low-T range. This was reported for various HTS, and the origin of the faster relaxation at low T appearing in standard magnetization relaxation measurements was usually related to specific pinning properties of the investigated specimens. Since the observed behaviour seems to be characteristic to all HTS with enhanced pinning (generated by random and/or correlated disorder), we show that the S(T) maximum can be explained in terms of classic collective vortex creep. The influence of thermo-magnetic instabilities in the low-T range is also evidenced. The collective (elastic) creep regime is generated by the T dependent macroscopic currents induced in the sample during standard magnetization measurements.
AB - The temperature T variation of the normalized magnetization relaxation rate S in high-temperature superconductors (HTS) with strong vortex pinning exhibits a maximum in the low-T range. This was reported for various HTS, and the origin of the faster relaxation at low T appearing in standard magnetization relaxation measurements was usually related to specific pinning properties of the investigated specimens. Since the observed behaviour seems to be characteristic to all HTS with enhanced pinning (generated by random and/or correlated disorder), we show that the S(T) maximum can be explained in terms of classic collective vortex creep. The influence of thermo-magnetic instabilities in the low-T range is also evidenced. The collective (elastic) creep regime is generated by the T dependent macroscopic currents induced in the sample during standard magnetization measurements.
KW - Elastic vortex creep
KW - Magnetization relaxation
KW - Normalized magnetization relaxation rate
KW - Thermo-magnetic instabilities
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U2 - 10.1016/j.physc.2010.05.054
DO - 10.1016/j.physc.2010.05.054
M3 - Article
AN - SCOPUS:77957906360
VL - 470
SP - 1126
EP - 1129
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
SN - 0921-4534
IS - 20
ER -