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

Han, Tian-Heng; Singleton, John; Schlueter, John A.

doi:10.1103/PhysRevLett.113.227203

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

Journal Article · Sat Nov 01 00:00:00 EDT 2014 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.113.227203· OSTI ID:1392100

Han, Tian-Heng; Singleton, John; Schlueter, John A.

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.

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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science - Office of Basic Energy Sciences - Materials Sciences and Engineering Division; National Science Foundation (NSF)

DOE Contract Number:: AC02-06CH11357

OSTI ID:: 1392100

Journal Information:: Physical Review Letters, Vol. 113, Issue 22; ISSN 0031-9007

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

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