期刊
PHYSICAL REVIEW LETTERS
卷 104, 期 13, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.104.137204
关键词
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资金
- NSF [DMR-0803510]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0803510] Funding Source: National Science Foundation
The ground state of a spin-1/2 Heisenberg chain with both frustration and long-range interactions is studied using Lanczos exact diagonalization. The evolution of the well-known dimerization transition of the system with short-range frustrated interactions (the J(1)-J(2) chain) is investigated in the presence of additional unfrustrated interactions decaying with distance as 1/r(alpha). It is shown that the continuous (infinite-order) dimerization transition develops into a first-order transition between a long-range ordered antiferromagnetic state and a state with coexisting dimerization and critical spin correlations at wave number k = pi/2. The relevance of the model to real systems is discussed.
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