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Materializing Rival Ground States in the Barlowite Family of Kago...

在戈薇磁铁的Barlowite家庭物化竞争对手理由是:量子自旋液体,自旋有序和价键晶国

【作       者】:

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【机       构】: 美国国家标准与技术研究院
【承研机构】:

【原文地址】: https://www.nist.gov/publications/materializing-rival-ground-states-barlowite-family-kagome-magnets-quantum-spin-liquid
【发表时间】:

2020-04-14

摘要

Quantum magnet display exotic phases that may be strongly influenced by small differences in structure and composition. Comprehensive structural and magnetic measurements (involving x-ray scattering, neutron scattering, and thermodynamic techniques) were performed on newly synthesized variants of barlowite (Cu(OH)FBr) and Zn-substituted barlowite. In contrast to orthorhombic Pnma barlowite, a novel single crystalline variant of barlowite has been synthesized with a less drastic symmetry lowering to hexagonal P6/m. The lesser amount of symmetry breaking results in an overall smaller ordered moment compared to orthorhombic barlowite, moving the hexagonal sample closer to a quantum spin liquid ground state. Sizable single crystals of Zn-substituted barlowite (CuZn(OH)FBr) were successfully grown, and no structural transition is observed down to T=0.1 K, consistent with a quantum spin liquid ground state. The magnetic response is compared to CuZn(OH)FBr (powder) and herbertsmithite (powder and crystal). These samples span a spectrum of quantum spin liquidness, allowing this exotic ground state to be probed systematically.

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