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We show that rotation of the magnetic field off the plane of twin boundaries(TB's) induces transition of an ordered vortex solid phase to a disordered one.This transition arises due to appearance of transverse deformations of vortexlines near the TB's, $u_{t,TB}$, the amplitude of which satisfies the Lindemanncriteria, $u_{t,rp}=c_La_0$. This order-disorder transition is accompanied byan increase in the depinning current, by crossover from an elastic creep toplastic one, and by appearance of the $S$-shaped voltage-currentcharacteristics.

Order-disorder transition induced by deformation of vortex lines at the  twin boundaries in YBa$_2$Cu$_3$O$_{7-\delta}$-crystals: test of the  Lindemann criteria