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Title: Electron doping a kagome spin liquid

Herbertsmithite, ZnCu 3(OH) 6Cl 2, 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 xCu 3(OH) 6Cl 2 from x=0 to x=1.8 (3/5 per Cu 2+). 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.
Authors:
 [1] ;  [1] ;  [1]
  1. The Johns Hopkins Univ., Baltimore, MD (United States)
Publication Date:
Grant/Contract Number:
FG02-08ER46544
Type:
Accepted Manuscript
Journal Name:
Physical Review. X
Additional Journal Information:
Journal Volume: 6; Journal Issue: 4; Journal ID: ISSN 2160-3308
Publisher:
American Physical Society
Research Org:
Johns Hopkins Univ., Baltimore, MD (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
OSTI Identifier:
1361679

Kelly, Z. A., Gallagher, M. J., and McQueen, T. M.. Electron doping a kagome spin liquid. United States: N. p., Web. doi:10.1103/PhysRevX.6.041007.
Kelly, Z. A., Gallagher, M. J., & McQueen, T. M.. Electron doping a kagome spin liquid. United States. doi:10.1103/PhysRevX.6.041007.
Kelly, Z. A., Gallagher, M. J., and McQueen, T. M.. 2016. "Electron doping a kagome spin liquid". United States. doi:10.1103/PhysRevX.6.041007. https://www.osti.gov/servlets/purl/1361679.
@article{osti_1361679,
title = {Electron doping a kagome spin liquid},
author = {Kelly, Z. A. and Gallagher, M. J. and McQueen, T. M.},
abstractNote = {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 ZnLixCu3(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.},
doi = {10.1103/PhysRevX.6.041007},
journal = {Physical Review. X},
number = 4,
volume = 6,
place = {United States},
year = {2016},
month = {10}
}