TY - JOUR
T1 - Low-field flux creep behavior near second peak H2p in Pr-doped Bi-2212 single crystal
AU - Hsu, Y. Y.
AU - Lin, C. Y.
AU - Lin, B. N.
AU - Sun, Y. P.
AU - Ku, H. C.
N1 - Funding Information:
This work is supported by NSC88-2112-M007-003 and −033.
PY - 2000/6/1
Y1 - 2000/6/1
N2 - Magnetic hysteresis M(H) and magnetic relaxation M(t) results on Pr-doped single-crystal Bi2Sr2Ca0.89Pr0.11Cu2O8+δ with optimum Tc = 88 K are reported. Superconducting H-T phase diagram with applied field parallel to single-crystal c-axis indicates that in the mixed state the anomalous second peak field and its onset field H2p/Hon varies from 900/800 G at 15 K to 210/85 G at 40 K with a plateau around 20-30 K. Low-field magnetic relaxation M(t) data near H2p/Hon indicates a distinct change of flux creep behavior. For H<Hon, the relaxation mechanism follows the collective creep model M(t) = M0[1+(μkBT/U0)ln(t/t0)]-1/μ and crosses to the vortex glass model M(t) = M0(t/t0)1/[1-(U(0)/k(B)T)] when H>Hon. Such a crossover behavior implies a change in vortex coupling mechanism from vortex quasi-lattice to entangled vortex glass.
AB - Magnetic hysteresis M(H) and magnetic relaxation M(t) results on Pr-doped single-crystal Bi2Sr2Ca0.89Pr0.11Cu2O8+δ with optimum Tc = 88 K are reported. Superconducting H-T phase diagram with applied field parallel to single-crystal c-axis indicates that in the mixed state the anomalous second peak field and its onset field H2p/Hon varies from 900/800 G at 15 K to 210/85 G at 40 K with a plateau around 20-30 K. Low-field magnetic relaxation M(t) data near H2p/Hon indicates a distinct change of flux creep behavior. For H<Hon, the relaxation mechanism follows the collective creep model M(t) = M0[1+(μkBT/U0)ln(t/t0)]-1/μ and crosses to the vortex glass model M(t) = M0(t/t0)1/[1-(U(0)/k(B)T)] when H>Hon. Such a crossover behavior implies a change in vortex coupling mechanism from vortex quasi-lattice to entangled vortex glass.
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U2 - 10.1016/S0921-4526(99)00789-9
DO - 10.1016/S0921-4526(99)00789-9
M3 - Conference article
AN - SCOPUS:0033893748
VL - 281-282
SP - 931
EP - 932
JO - Physica B: Condensed Matter
JF - Physica B: Condensed Matter
SN - 0921-4526
T2 - Yamada Conference LI - The International Conference on Strongly Correlated Electron Systems (SCES '99)
Y2 - 24 August 1999 through 28 August 1999
ER -