Flux distribution in polycrystalline YBa2Cu3O7
نویسندگان
چکیده
منابع مشابه
Dynamics of the dendritic flux instability in YBa2Cu3O7-δ films
– We have studied the dynamics of magnetic-flux avalanches in superconducting YBa2Cu3O7−δ films by means of a fast magneto-optic pump-probe technique. Two regimes of propagation are found: in regime I, directly after the nucleation of the avalanches by a femtosecond laser pulse, the velocity v of the flux dendrites depends strongly on the magnetic field, and values of v up to 180 km/s are obser...
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We study the magnetic flux landscape in YBa2Cu3O7−x thin films as a two dimensional rough surface. The vortex density in the superconductor forms a self-affine structure in both space and time. This is characterized by a roughness exponent α = 0.76(3) and a growth exponent β = 0.57(6). This is due to the structure and distribution of flux avalanches in the self-organized critical state, which i...
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The d.c. I-V characteristic of polycrystalline YBa2Cu3O7−x high temperature superconductors (HTSC) is measured near the transition temperature (Tc). The Tc was found to be 90 K with a width of 2 K. The voltage was measured at various current values and with reversing the current. A difference in voltage was found for forward and reverse current directions near Tc. The observed directionality of...
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متن کاملEffect of high-intensity ultrasound on superconducting properties of polycrystalline YBa2Cu3O7−x
High intensity ultrasonic irradiation (sonication) of alkane slurries of polycrystalline YBa2Cu3O7−x leads to a significant modification of the grain morphology and, if performed with enforced oxygen flow, results in the increase of the superconducting transition temperature. Sonication with added Fe(CO)5 produces magnetic Fe2O3 nanoparticles deposited on the surface of YBa2Cu3O7−x (YBCO) granu...
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ژورنال
عنوان ژورنال: Physica B: Condensed Matter
سال: 1990
ISSN: 0921-4526
DOI: 10.1016/s0921-4526(09)80279-2