KFeCuTe2: a new compound to study the removal of interstitial Fe in layered tellurides

Fan Sun; Zhongnan Guo; Ning Liu; Kun Lin; Da Wang; Wenxia Yuan

doi:10.1039/c7dt00219j

KFeCuTe₂: a new compound to study the removal of interstitial Fe in layered tellurides

Fan Sun, Zhongnan Guo, Ning Liu, Kun Lin, Da Wang, Wenxia Yuan

Research output: Contribution to journal › Article › peer-review

Abstract

A single crystal of a new layered telluride KFeCuTe₂ has been successfully synthesized by the self-flux method, which is formed by intercalating K in the parent telluride Fe_1+xCuTe₂. This new compound crystallizes in the space group I4/mmm with the interstitial Fe in pristine Fe_1+xCuTe₂ completely removed after K intercalation. X-ray photoelectron spectroscopy (XPS) shows that after intercalation, the valence of Fe switched from a mixture of +2 and +3 to the single trivalent one. The KFeCuTe₂ is a Mott semiconductor (E_g = 1.06 eV) with a larger resistivity than that of Fe_1+xCuTe₂ due to the absence of electron doping from interstitial Fe atoms. Most importantly, the magnetic susceptibility shows the antiferromagnetic transition in KFeCuTe₂ at 60 K, instead of the spin-glass behavior in Fe_1+xCuTe₂, indicating the crucial role of interstitial Fe in breaking the long-range magnetic ordering. Our work provides a new compound to study the effect of interstitial Fe on the crystal and magnetic structure in layered tellurides.

Original language	English
Pages (from-to)	3649-3654
Number of pages	6
Journal	Dalton Transactions
Volume	46
Issue number	11
DOIs	https://doi.org/10.1039/c7dt00219j
Publication status	Published - 2017
Externally published	Yes

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@article{09190bb8a8904348b197d819f4a8acc2,

title = "KFeCuTe2: a new compound to study the removal of interstitial Fe in layered tellurides",

abstract = "A single crystal of a new layered telluride KFeCuTe2 has been successfully synthesized by the self-flux method, which is formed by intercalating K in the parent telluride Fe1+xCuTe2. This new compound crystallizes in the space group I4/mmm with the interstitial Fe in pristine Fe1+xCuTe2 completely removed after K intercalation. X-ray photoelectron spectroscopy (XPS) shows that after intercalation, the valence of Fe switched from a mixture of +2 and +3 to the single trivalent one. The KFeCuTe2 is a Mott semiconductor (Eg = 1.06 eV) with a larger resistivity than that of Fe1+xCuTe2 due to the absence of electron doping from interstitial Fe atoms. Most importantly, the magnetic susceptibility shows the antiferromagnetic transition in KFeCuTe2 at 60 K, instead of the spin-glass behavior in Fe1+xCuTe2, indicating the crucial role of interstitial Fe in breaking the long-range magnetic ordering. Our work provides a new compound to study the effect of interstitial Fe on the crystal and magnetic structure in layered tellurides.",

author = "Fan Sun and Zhongnan Guo and Ning Liu and Kun Lin and Da Wang and Wenxia Yuan",

note = "Publisher Copyright: {\textcopyright} The Royal Society of Chemistry.",

year = "2017",

doi = "10.1039/c7dt00219j",

language = "English",

volume = "46",

pages = "3649--3654",

journal = "Dalton Transactions",

issn = "1477-9226",

number = "11",

}

TY - JOUR

T1 - KFeCuTe2

T2 - a new compound to study the removal of interstitial Fe in layered tellurides

AU - Sun, Fan

AU - Guo, Zhongnan

AU - Liu, Ning

AU - Lin, Kun

AU - Wang, Da

AU - Yuan, Wenxia

N1 - Publisher Copyright: © The Royal Society of Chemistry.

PY - 2017

Y1 - 2017

N2 - A single crystal of a new layered telluride KFeCuTe2 has been successfully synthesized by the self-flux method, which is formed by intercalating K in the parent telluride Fe1+xCuTe2. This new compound crystallizes in the space group I4/mmm with the interstitial Fe in pristine Fe1+xCuTe2 completely removed after K intercalation. X-ray photoelectron spectroscopy (XPS) shows that after intercalation, the valence of Fe switched from a mixture of +2 and +3 to the single trivalent one. The KFeCuTe2 is a Mott semiconductor (Eg = 1.06 eV) with a larger resistivity than that of Fe1+xCuTe2 due to the absence of electron doping from interstitial Fe atoms. Most importantly, the magnetic susceptibility shows the antiferromagnetic transition in KFeCuTe2 at 60 K, instead of the spin-glass behavior in Fe1+xCuTe2, indicating the crucial role of interstitial Fe in breaking the long-range magnetic ordering. Our work provides a new compound to study the effect of interstitial Fe on the crystal and magnetic structure in layered tellurides.

AB - A single crystal of a new layered telluride KFeCuTe2 has been successfully synthesized by the self-flux method, which is formed by intercalating K in the parent telluride Fe1+xCuTe2. This new compound crystallizes in the space group I4/mmm with the interstitial Fe in pristine Fe1+xCuTe2 completely removed after K intercalation. X-ray photoelectron spectroscopy (XPS) shows that after intercalation, the valence of Fe switched from a mixture of +2 and +3 to the single trivalent one. The KFeCuTe2 is a Mott semiconductor (Eg = 1.06 eV) with a larger resistivity than that of Fe1+xCuTe2 due to the absence of electron doping from interstitial Fe atoms. Most importantly, the magnetic susceptibility shows the antiferromagnetic transition in KFeCuTe2 at 60 K, instead of the spin-glass behavior in Fe1+xCuTe2, indicating the crucial role of interstitial Fe in breaking the long-range magnetic ordering. Our work provides a new compound to study the effect of interstitial Fe on the crystal and magnetic structure in layered tellurides.

UR - https://www.scopus.com/pages/publications/85015700006

U2 - 10.1039/c7dt00219j

DO - 10.1039/c7dt00219j

M3 - Article

C2 - 28252140

AN - SCOPUS:85015700006

SN - 1477-9226

VL - 46

SP - 3649

EP - 3654

JO - Dalton Transactions

JF - Dalton Transactions

IS - 11

ER -

KFeCuTe₂: a new compound to study the removal of interstitial Fe in layered tellurides

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