Interplay between spin frustration and thermal entanglement in the exactly solved Ising-Heisenberg tetrahedral chain

► Using local gauge symmetry we solved the spin-1/2 Ising-Heisenberg tetrahedral chain. ► The frustration temperature was calculated using the correlation functions. ► Thermal entanglement, concurrence and threshold temperature were analyzed. ► The zero-field specific heat was exactly calculated and discussed.