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

• Tác giả: Los Alamos National Laboratory, United States, United States. National Nuclear Security Administration
• 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: Báo, Tạp chí
• ID: 255788
• Chủ đề: 1. 30 direct energy conversion; 2. 36 materials science; 3. Antiferromagnetism; 4. Antiferromagnets; 5. Kagome lattice; 6. Magnetization measurements; 7. Single crystal materials; 8. Spin lattice models

Tóm tắt

 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.