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

Abstract

Despite decades-long fascination, the difficulty of maintaining high lattice symmetry in frustrated nonbipartite S = 1/2 materials that can also be made into high-quality single crystals has been a persistent challenge. Here we report magnetization studies of a single-crystal sample of barlowite, Cu-4(OH) 6FBr, which has a geometrically perfect kagome motif. At T ≤ 4.2 K and 35 ≤ mu H-0 ≤ 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:
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)
OSTI Identifier:
1320837
Report Number(s):
LA-UR-15-22247
Journal ID: ISSN 2469-9950; PRBMDO; 129526
DOE Contract Number:  
AC52-06NA25396; FG02-99ER45789; AC02-06CH11357; DMR-1157490
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review B; Journal Volume: 93; Journal Issue: 21
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; STATE; ANTIFERROMAGNET; LATTICE; LIQUID

Citation Formats

Han, Tian-Heng, Isaacs, Eric D., Schlueter, John A., and Singleton, John. Anisotropy: Spin order and magnetization of single-crystalline Cu4(OH)6FBr barlowite. United States: N. p., 2016. Web. doi:10.1103/PhysRevB.93.214416.
Han, Tian-Heng, Isaacs, Eric D., Schlueter, John A., & Singleton, John. Anisotropy: Spin order and magnetization of single-crystalline Cu4(OH)6FBr barlowite. United States. doi:10.1103/PhysRevB.93.214416.
Han, Tian-Heng, Isaacs, Eric D., Schlueter, John A., and Singleton, John. Wed . "Anisotropy: Spin order and magnetization of single-crystalline Cu4(OH)6FBr barlowite". United States. doi:10.1103/PhysRevB.93.214416.
@article{osti_1320837,
title = {Anisotropy: Spin order and magnetization of single-crystalline Cu4(OH)6FBr barlowite},
author = {Han, Tian-Heng and Isaacs, Eric D. and Schlueter, John A. and Singleton, John},
abstractNote = {Despite decades-long fascination, the difficulty of maintaining high lattice symmetry in frustrated nonbipartite S = 1/2 materials that can also be made into high-quality single crystals has been a persistent challenge. Here we report magnetization studies of a single-crystal sample of barlowite, Cu-4(OH)6FBr, which has a geometrically perfect kagome motif. At T ≤ 4.2 K and 35 ≤ mu H-0 ≤ 65 T, the interlayer spins are fully polarized, and the kagome-intrinsic magnetization is consistent with a Heisenberg model having J/kB = -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.},
doi = {10.1103/PhysRevB.93.214416},
journal = {Physical Review B},
number = 21,
volume = 93,
place = {United States},
year = {Wed Jun 15 00:00:00 EDT 2016},
month = {Wed Jun 15 00:00:00 EDT 2016}
}