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Chemical and structural disorder in the kagome spin S=12 systems ZnCu3(OH)6Cl2 and YCu3(OH)6Br2[Brx(OH)1−x]

IF 3.7 2区 物理与天体物理 Q1 Physics and Astronomy
Physical Review B Pub Date : 2025-01-27 DOI:10.1103/physrevb.111.024424
Reinhard K. Kremer, Sebastian Bette, Jürgen Nuss, Pascal Puphal
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引用次数: 0

Abstract

By single crystal diffraction we characterize the chemostructural disorder introduced by Zn-Cu site mixing in the kagome spin S=12 systems herbertsmithite ZnCu3(OH)6Cl2 and YCu3(OH)6Br2[Brx(OH)1−x]. For an untwinned single crystal of herbertsmithite of composition Zn0.95(1)Cu2.99(3)O5.9(1)H5.8(1)Cl2 we find substitution by Cu of the Zn atoms in the layers separating the kagome layers as well as substantial Zn substitution for Cu in the kagome layers. In YCu3(OH)6Br2[Brx(OH)1−x] site mixing disorder is present for intermediate x. Analogous to the Cl homologous system in crystals with x=1/3 disorder is absent and a low-temperature structural transition emerges driven by strong magnetophonon coupling as a release of frustration. Apart from this structural anomaly we find the physical properties of these crystals unchanged compared to intermediate x and closely resembling the Cl homologue where long-range magnetic order was observed. Published by the American Physical Society 2025
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来源期刊
Physical Review B
Physical Review B 物理-物理：凝聚态物理
CiteScore
6.70
自引率
32.40%
发文量
0
审稿时长
3.0 months
期刊介绍： Physical Review B (PRB) is the world’s largest dedicated physics journal, publishing approximately 100 new, high-quality papers each week. The most highly cited journal in condensed matter physics, PRB provides outstanding depth and breadth of coverage, combined with unrivaled context and background for ongoing research by scientists worldwide. PRB covers the full range of condensed matter, materials physics, and related subfields, including: -Structure and phase transitions -Ferroelectrics and multiferroics -Disordered systems and alloys -Magnetism -Superconductivity -Electronic structure, photonics, and metamaterials -Semiconductors and mesoscopic systems -Surfaces, nanoscience, and two-dimensional materials -Topological states of matter
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