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We identify a phase transition in the vortex system of a high-temperaturesuperconductor with nano-columnar stacks of precipitates as strong vortexpinning centers. Above a particular, temperature-dependent field $B_X(T)$ thevortex response is no longer determined by the nano-columns, and is insteaddetermined by point-like pinning. This phase transition leads to the change inthe measured critical current density as a function of angle between theapplied magnetic field and the nano-columns. Below the unbinding, there is astrong maximum in $J_C$ when field is aligned parallel to the columns. Abovethe unbinding, there is a minimum for this orientation.

Transition from columnar to point pinning in coated conductors: critical currents, that are independent of magnetic field direction