Journal
PHYSICAL REVIEW B
Volume 92, Issue 22, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.92.220404
Keywords
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Funding
- European Research Council [ERC-StG-TOPOLECTRICS-Thomale-336012]
- Office of Naval Research through the Naval Research Laboratory's Basic Research Program
- DFG (Deutsche Forschungsgemeinschaft) [SFB/TRR 49, FOR 1346]
- Freie Universitat Berlin within the Excellence Initiative of the German Research Foundation
- [SFB 1170]
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Frustrated magnetism on the kagome lattice has been a fertile ground for rich and fascinating physics, ranging from experimental evidence of a spin liquid to theoretical predictions of exotic superconductivity. Among experimentally realized spin-1/2 kagome magnets, herbertsmithite, kapellasite, and haydeeite [(Zn,Mg)Cu-3(OH)(6)Cl-2] are all well described by a three-parameter Heisenberg model, but they exhibit distinctly different physics. We address the problem using a pseudofermion functional renormalization-group approach and analyze the low-energy physics in the experimentally accessible parameter range. Our analysis places kapellasite and haydeeite near the boundaries between magnetically ordered and disordered phases, implying that slight modifications could dramatically affect their magnetic properties. Inspired by this, we perform ab initio density functional theory calculations of (Zn,Mg,Cd)Cu-3 (OH)(6)Cl-2 at various pressures. Our results suggest that by varying pressure and composition one can traverse a paramagnetic regime between different magnetically ordered phases.
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