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We theoretically investigate the Heisenberg antiferromagnet on a triangularlattice doped with nonmagnetic impurities. Two nontrivial effects resultingfrom collective impurity behavior are predicted. The first one is related topresence of uncompensated magnetic moments localized near vacancies as revealedby the low-temperature Curie tail in the magnetic susceptibility. These momentsexhibit an anomalous growth with the impurity concentration, which we attributeto the clustering mechanism. In an external magnetic field, impurities lead toan even more peculiar phenomenon lifting the classical ground-state degeneracyin favor of the conical state. We analytically demonstrate that vacanciesspontaneously generate a positive biquadratic exchange, which is responsiblefor the above degeneracy lifting.

Collective impurity effects in the Heisenberg triangular antiferromagnet