Strong coupling of the iron-quadrupole and anion-dipole polarizations in Ba (Fe1-xCox)2As2

Chao Ma; Lijun Wu; Wei Guo Yin; Huaixin Yang; Honglong Shi; Zhiwei Wang; Jianqi Li; C. C. Homes; Yimei Zhu

doi:10.1103/PhysRevLett.112.077001

Strong coupling of the iron-quadrupole and anion-dipole polarizations in Ba (Fe1-xCox)2As2

Chao Ma, Lijun Wu, Wei Guo Yin, Huaixin Yang, Honglong Shi, Zhiwei Wang, Jianqi Li, C. C. Homes, Yimei Zhu

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

25 Citations (Scopus)

Abstract

We use a quantitative convergent beam electron diffraction based method to image the valence electron density distribution in Ba(Fe1-xCox)2As2. We show a remarkable increase in both the charge quadrupole of the Fe cations and the charge dipole of the arsenic anions upon Co doping from x=0 (Tc=0 K) to x=0.1 (Tc=22.5 K). Our data suggest that an unexpected electronic correlation effect, namely strong coupling of Fe orbital fluctuation and anion electronic polarization, is present in iron-based superconductors.

Original language	English
Article number	077001
Journal	Physical Review Letters
Volume	112
Issue number	7
DOIs	https://doi.org/10.1103/PhysRevLett.112.077001
Publication status	Published - 20 Feb 2014
Externally published	Yes

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10.1103/PhysRevLett.112.077001

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title = "Strong coupling of the iron-quadrupole and anion-dipole polarizations in Ba (Fe1-xCox)2As2",

abstract = "We use a quantitative convergent beam electron diffraction based method to image the valence electron density distribution in Ba(Fe1-xCox)2As2. We show a remarkable increase in both the charge quadrupole of the Fe cations and the charge dipole of the arsenic anions upon Co doping from x=0 (Tc=0 K) to x=0.1 (Tc=22.5 K). Our data suggest that an unexpected electronic correlation effect, namely strong coupling of Fe orbital fluctuation and anion electronic polarization, is present in iron-based superconductors.",

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T1 - Strong coupling of the iron-quadrupole and anion-dipole polarizations in Ba (Fe1-xCox)2As2

AU - Ma, Chao

AU - Wu, Lijun

AU - Yin, Wei Guo

AU - Yang, Huaixin

AU - Shi, Honglong

AU - Wang, Zhiwei

AU - Li, Jianqi

AU - Homes, C. C.

AU - Zhu, Yimei

PY - 2014/2/20

Y1 - 2014/2/20

N2 - We use a quantitative convergent beam electron diffraction based method to image the valence electron density distribution in Ba(Fe1-xCox)2As2. We show a remarkable increase in both the charge quadrupole of the Fe cations and the charge dipole of the arsenic anions upon Co doping from x=0 (Tc=0 K) to x=0.1 (Tc=22.5 K). Our data suggest that an unexpected electronic correlation effect, namely strong coupling of Fe orbital fluctuation and anion electronic polarization, is present in iron-based superconductors.

AB - We use a quantitative convergent beam electron diffraction based method to image the valence electron density distribution in Ba(Fe1-xCox)2As2. We show a remarkable increase in both the charge quadrupole of the Fe cations and the charge dipole of the arsenic anions upon Co doping from x=0 (Tc=0 K) to x=0.1 (Tc=22.5 K). Our data suggest that an unexpected electronic correlation effect, namely strong coupling of Fe orbital fluctuation and anion electronic polarization, is present in iron-based superconductors.

UR - http://www.scopus.com/inward/record.url?scp=84894688921&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.112.077001

DO - 10.1103/PhysRevLett.112.077001

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VL - 112

JO - Physical Review Letters

JF - Physical Review Letters

IS - 7

M1 - 077001

ER -

Strong coupling of the iron-quadrupole and anion-dipole polarizations in Ba (Fe1-xCox)2As2

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