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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:
; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science - Office of Basic Energy Sciences - Materials Sciences and Engineering Division; National Science Foundation (NSF)
OSTI Identifier:
1320837
DOE Contract Number:
AC02-06CH11357
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. 2016. "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 = 2016,
month = 6
}