Quantum Phase Transitions in Alternating-Bond Mixed Diamond Chains with Spins 1 and 1/2
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概要
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We investigate the mixed diamond chain composed of spins 1 and 1/2 when the exchange interaction is alternatingly distorted. Depending on the strengths of frustration and distortion, this system has various ground states. Each ground state consists of an array of spin clusters separated by singlet dimers by virtue of an infinite number of local conservation laws. We determine the ground-state phase diagram by numerically analyzing each spin cluster. In particular, for strong distortions, we find an infinite series of quantum phase transitions using the cluster expansion method and conformal field theory. This leads to an infinite series of steps in the behavior of Curie constant and residual entropy.
- 2010-04-15
著者
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Hida Kazuo
Division Of Material Science Graduate School Of Science And Engineering Saitama University
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Suzuki Hidenori
Toyota Technological Institute
関連論文
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