Anisotropy [electronic resource] : Spin order and magnetization of single-crystalline <math><mrow><msub><mi>Cu</mi><mn>4</mn></msub><msub><mrow><mo>(</mo><mi>OH</mi><mo>)</mo></mrow><mn>6</mn></msub><mi>FBr</mi></mrow></math> barlowite

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Tác giả:

Ngôn ngữ: eng

Ký hiệu phân loại: 541.37 Electrochemistry and magnetochemistry

Thông tin xuất bản: Washington, D.C. : Oak Ridge, Tenn. : United States. National Nuclear Security Administration ; Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2016

Mô tả vật lý: Size: Article No: 214416 : , digital, PDF file.

Bộ sưu tập: Metadata

ID: 255788

 Despite decades-long fascination, the difficulty of maintaining high lattice symmetry in frustrated nonbipartite S = $\frac{1}{2}$ materials that can also be made into high-quality single crystals has been a persistent challenge. We report magnetization studies of a single-crystal sample of barlowite, Cu<
 sub>
 4<
 /sub>
  (OH)<
 sub>
 6<
 /sub>
  FBr, which has a geometrically perfect kagome motif. At T ? 4.2 K and 35 ? ?<
 sub>
 0<
 /sub>
 H ? 65 T, the interlayer spins are fully polarized, and the kagome-intrinsic magnetization is consistent with a Heisenberg model having J/k<
 sub>
 B<
 /sub>
  = -180 K. Several field-driven anomalies are observed, having varied scalings with temperature. At an applied field, kagome disorder caused by the interlayer spins is smaller than that in herbertsmithite. At T ? 15 K, the bulk magnetic moment comes from the interlayer spins. An almost coplanar spin order suggests that the magnitude of in-plane Dzyaloshinskii-Moriya interaction is smaller than 0.006(6) J. On the other hand, the possibility of a spin-liquid state in the kagome lattice coexisting with ordered interlayer spins is left open.
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