We succeeded in reducing alternating-current (ac) transport
losses at 77 K and 50 Hz for the (Bi, Pb)2Sr2Ca2Cu3Ox
tape-form conductor with 39 filaments, fabricated by a four-roller machine
to make a rectangular deformation and also by the introduction of
Bi2Sr2CuOx sheets as resistive barriers in an arrangement parallel
to a tape surface. Although the main contribution to the losses comes from
the hysteresis loss of the superconductor, the loss value for the conductor
is reduced by approximately 70% compared with the value for the
(Bi, Pb)2Sr2Ca2Cu3Ox multifilamentary tape prepared by an
ordinary powder-in-tube process without the resistive barriers. Using
numerical calculations we ascribe this loss reduction to the division of
field-free-core under ac current transmission, caused by introduction of
the barriers.
Anomalous electric response of La2-x
Sr
x
CuO4 thin film at Sr doping levels of x≈1/4 and 1/16 is observed when charge moves along the c axis. The capacitance C
t of the Pd/La2-x
Sr
x
CuO4/SrTiO3/Pd structure increases sharply, exceeding the capacitance C
STO of the Pd/SrTiO3/Pd structure. Oscillatory negative voltage is observed in 4-terminal resistivity measurements of La2-x
Sr
x
CuO4 thin film using Pd electrodes at small current. These phenomena are explained by a model of the spatial ordered state in which CuO2 layers of La2-x
Sr
x
CuO4 is replete with O hole pairs.
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