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We have performed V-I measurements on a thin film YBa2Cu3O7 4^o [001] tiltlow angle grain boundary over an extensive range of temperature and field,verifying the presence of a linear characteristic. We report on the occurrenceof the linear characteristic in its basic form and on the observation of V-Ikinking into several, and in some cases numerous, linear segments. We interpretthese findings in terms of a variation in the dissipative width at the grainboundary. Kinking from one linear V-I section to another of different gradientis described in terms of a change in the number of vortex rows being viscouslychanneled along the boundary.Comment: 14 pages including 4 figures. To be published in Applied Physics  Letter

Vortex channeling and the voltage–current characteristics of YBa2Cu3O7 low-angle grain boundaries