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Title: Barlowite: A Spin- 1 / 2 Antiferromagnet with a Geometrically Perfect Kagome Motif

Abstract

We present thermodynamic studies of a new spin-1/2 antiferromagnet containing undistorted kagome lattices-barlowite Cu-4(OH)(6)FBr. Magnetic susceptibility gives theta(CW) = -136 K, while long-range order does not happen until T-N = 15 K with a weak ferromagnetic moment mu < 0.1 mu(B)/Cu. A 60 T magnetic field induces a moment less than 0.5 mu(B)/Cu at T = 0.6 K. Specific-heat measurements have observed multiple phase transitions at T << vertical bar theta(CW)vertical bar. The magnetic entropy of these transitions is merely 18% of k(B) ln 2 per Cu spin. These observations suggest that nontrivial spin textures are realized in barlowite with magnetic frustration. Comparing with the leading spin-liquid candidate herbertsmithite, the superior interkagome environment of barlowite sheds light on new spin-liquid compounds with minimum disorder. The robust perfect geometry of the kagome lattice makes charge doping promising.

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:
1392100
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 113; Journal Issue: 22; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English

Citation Formats

Han, Tian-Heng, Singleton, John, and Schlueter, John A. Barlowite: A Spin- 1/2 Antiferromagnet with a Geometrically Perfect Kagome Motif. United States: N. p., 2014. Web. doi:10.1103/PhysRevLett.113.227203.
Han, Tian-Heng, Singleton, John, & Schlueter, John A. Barlowite: A Spin- 1/2 Antiferromagnet with a Geometrically Perfect Kagome Motif. United States. doi:10.1103/PhysRevLett.113.227203.
Han, Tian-Heng, Singleton, John, and Schlueter, John A. Sat . "Barlowite: A Spin- 1/2 Antiferromagnet with a Geometrically Perfect Kagome Motif". United States. doi:10.1103/PhysRevLett.113.227203.
@article{osti_1392100,
title = {Barlowite: A Spin- 1/2 Antiferromagnet with a Geometrically Perfect Kagome Motif},
author = {Han, Tian-Heng and Singleton, John and Schlueter, John A.},
abstractNote = {We present thermodynamic studies of a new spin-1/2 antiferromagnet containing undistorted kagome lattices-barlowite Cu-4(OH)(6)FBr. Magnetic susceptibility gives theta(CW) = -136 K, while long-range order does not happen until T-N = 15 K with a weak ferromagnetic moment mu < 0.1 mu(B)/Cu. A 60 T magnetic field induces a moment less than 0.5 mu(B)/Cu at T = 0.6 K. Specific-heat measurements have observed multiple phase transitions at T << vertical bar theta(CW)vertical bar. The magnetic entropy of these transitions is merely 18% of k(B) ln 2 per Cu spin. These observations suggest that nontrivial spin textures are realized in barlowite with magnetic frustration. Comparing with the leading spin-liquid candidate herbertsmithite, the superior interkagome environment of barlowite sheds light on new spin-liquid compounds with minimum disorder. The robust perfect geometry of the kagome lattice makes charge doping promising.},
doi = {10.1103/PhysRevLett.113.227203},
journal = {Physical Review Letters},
issn = {0031-9007},
number = 22,
volume = 113,
place = {United States},
year = {2014},
month = {11}
}

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