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We investigate the entanglement between any two spins in a one dimensionalHeisenberg chain as a function of temperature and the external magnetic field.We find that the entanglement in an antiferromagnetic chain can be increased byincreasing the temperature or the external field. Increasing the field can alsocreate entanglement between otherwise disentangled spins. This entanglement canbe confirmed by testing Bell's inequalities involving any two spins in thesolid.Comment: 4 pages, 5 figure

Natural Thermal and Magnetic Entanglement in the 1D Heisenberg Model