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Comparison between disordered quantum spin-1/2 chains
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DOI：10.1103/PhysRevB.74.224435.png)
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Abstract
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We study the magnetic properties of two types of one-dimensional XX spin-(1)/(2) chains. The first type has only nearest-neighbor interactions which can be either antiferromagnetic or ferromagnetic, and the second type has both nearest-neighbor and next-nearest-neighbor interactions, but only antiferromagnetic in character. We study these systems in the presence of low magnetic fields both analytically and numerically. Comparison of results shows a close relation between the two systems, which is in agreement with results previously found in Heisenberg chains by means of a numerical real-space renormalization-group procedure.
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