Magnetic properties of bulk melthyphen;textured YBa2Cu3O7prepared in a solar furnace were investigated. The material obtained demonstrates high critical current density of the order of 105A/cm2in the field of a 1 T at 50 K. The effective activation energy for flux creep was calculated using Maleyrsquo;s approach and fits the universal relation:Ueff=U0G(T)(J/Jc)minus;n, wheren=3/2, which agrees with the result predicted by the collective flux creep theory. copy;1996 American Institute of Physics.
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