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Title: Anisotropy: Spin order and magnetization of single-crystalline Cu 4 ( OH ) 6 FBr barlowite

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 4 (OH) 6 FBr, which has a geometrically perfect kagome motif. At T ≤ 4.2 K and 35 ≤ μ 0H ≤ 65 T, the interlayer spins are fully polarized, and the kagome-intrinsic magnetization is consistent with a Heisenberg model having J/k B = -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.
Authors:
 [1] ;  [2] ;  [3] ; ORCiD logo [4]
  1. Univ. of Chicago, IL (United States). James Frank Inst. and Dept. of Physics; Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division
  2. Univ. of Chicago, IL (United States). James Frank Inst. and Dept. of Physics
  3. Argonne National Lab. (ANL), Argonne, IL (United States). Materials Science Division; National Science Foundation (NSF), Arlington, VA (United States). Division of Materials Research
  4. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Report Number(s):
LA-UR-15-22247
Journal ID: ISSN 2469-9950; PRBMDO
Grant/Contract Number:
AC52-06NA25396; FG02-99ER45789; AC02-06CH11357; DMR-1157490
Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 93; Journal Issue: 21; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Science Foundation (NSF)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 30 DIRECT ENERGY CONVERSION; antiferromagnetism; antiferromagnets; kagome lattice; single crystal materials; magnetization measurements; spin lattice models
OSTI Identifier:
1457234
Alternate Identifier(s):
OSTI ID: 1257493