期刊
PHYSICAL REVIEW B
卷 101, 期 2, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.101.020411
关键词
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资金
- Deutsche Forschungsgemeinschaft through SFB 1143 [247310070]
- Wurzburg-Dresden Cluster of Excellence on Complexity and Topology in Quantum Matter-ct.qmat (EXC 2147) [390858490]
- CNPq (BR) [302065/2016-4]
We consider frustrated Heisenberg antiferromagnets, whose clean-limit ground state is characterized by noncollinear long-range order with nonzero vector chirality, and study the effects of quenched bond disorder, i.e., random exchange couplings. A single bond defect is known to induce a dipolar texture in the spin background independent of microscopic details. Using general analytical arguments as well as large-scale simulations for the classical triangular-lattice Heisenberg model, we show that any finite concentration of such defects destroys long-range order for spatial dimension d <= 2, in favor of a glassy state whose correlation length in d = 2 is exponentially large for small randomness. Our results are relevant for a wide range of layered frustrated magnets.
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