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We investigate the low-temperature thermodynamics of the spin-1/2 Heisenbergchain with open ends. On the basis of boundary conformal field theory argumentsand numerical density matrix renormalization group calculations, it isestablished that in the isotropic case the impurity susceptibility exhibits aCurie-like divergent behavior as the temperature decreases, even in the absenceof magnetic impurities. A similar singular temperature dependence is also foundin the boundary contributions of the specific heat coefficient. In theanisotropic case, for $1/2<\Delta<1$, these boundary quantities still showsingular temperature dependence obeying a power law with an anomalousdimension. Experimental consequences will be discussed.Comment: 5 pages, 1 figure, final versio

physical review letters

Boundary Susceptibility in the Spin-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mn>1</mml:mn><mml:mo>/</mml:mo><mml:mn>2</mml:mn></mml:math>Chain: Curie-Like Behavior without Magnetic Impurities

Boundary Susceptibility in the Spin-1/2Chain: Curie-Like Behavior without Magnetic Impurities