Electron doping a kagome spin liquid

Kelly, Z. A.; Gallagher, M. J.; McQueen, T. M.

doi:10.1103/PhysRevX.6.041007

Title: Electron doping a kagome spin liquid

Journal Article · Thu Oct 13 00:00:00 EDT 2016 · Physical Review. X

DOI:https://doi.org/10.1103/PhysRevX.6.041007· OSTI ID:1361679

Kelly, Z. A. ^[1]; Gallagher, M. J. ^[1]; McQueen, T. M. ^[1]

The Johns Hopkins Univ., Baltimore, MD (United States)

Herbertsmithite, ZnCu₃(OH)₆Cl₂, is a two-dimensional kagome lattice realization of a spin liquid, with evidence for fractionalized excitations and a gapped ground state. Such a quantum spin liquid has been proposed to underlie high-temperature superconductivity and is predicted to produce a wealth of new states, including a Dirac metal at 1/3 electron doping. Here, we report the topochemical synthesis of electron-doped ZnLi_xCu₃(OH)₆Cl₂ from x=0 to x=1.8 (3/5 per Cu²⁺). Contrary to expectations, no metallicity or superconductivity is induced. Instead, we find a systematic suppression of magnetic behavior across the phase diagram. Lastly, our results demonstrate that significant theoretical work is needed to understand and predict the role of doping in magnetically frustrated narrow band insulators, particularly the interplay between local structural disorder and tendency toward electron localization, and pave the way for future studies of doped spin liquids.

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Research Organization:: Johns Hopkins Univ., Baltimore, MD (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: FG02-08ER46544

OSTI ID:: 1361679

Journal Information:: Physical Review. X, Vol. 6, Issue 4; ISSN 2160-3308

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 55 works

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