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We discuss the angular momentum blockade in small d-wave superconductinggrains in an external field. We find that abrupt changes in angular momentumstate of the condensate, angular momentum blockade, occur as a result ofchanges in the angular momentum of the condensate in an external magneticfield. The effect rep- resents a direct analogy with the Coulomb blockade. Weuse the Ginzburg-Landau formalism to illustrate how a magnetic field induces adeviation from the d-wave symmetry which is described by a (d + id')-orderparameter. We derive the behavior of the volume magnetic susceptibility as afunction of the magnetic field, and corresponding magnetization jumps atcritical values of the field that should be experimentally observable insuperconducting grains.

Angular momentum blockade in nanoscale high-T_c superconducting grains