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Finite low-temperature entropy of some strongly frustrated quantum spin lattices in the vicinity of the saturation field
For a class of highly frustrated antiferromagnetic quantum spin lattices the ground state exhibits a huge degeneracy in high magnetic fields due to the existence of localized magnon states. For some of these spin lattices (in particular, the 1D dimer-plaquette, sawtooth and kagom\'{e}-like chains as well as the 2D kagom\'{e} …