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Triangular symmetry stabilizes a novel non-Fermi-liquid phase in thethree-impurity Kondo model with frustrating antiferromagnetic interactionsbetween half-integer impurity spins. The phase arises without fine-tuning ofcouplings, and is stable against magnetic fields and particle-hole symmetrybreaking. We find a conformal field theory describing this phase, verify itusing the numerical renormalization group, and extract various exact, universallow-energy properties. Signatures predicted in electrical transport may betestable in scanning tunneling microscopy or quantum-dot experiments.Comment: 4 pages, published version (shortened, minor corrections

Kondo Screening in a Magnetically Frustrated Nanostructure: Exact Results on a Stable Non-Fermi-Liquid Phase