Evidence of Nematicity in K0.8Fe1.7Se2

Duan, Chunruo; Yang, Junjie; Ye, Feng; Louca, Despina

doi:10.1007/s10948-015-3327-8

Title: Evidence of Nematicity in K_0.8Fe_1.7Se₂

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Abstract

We proposed that the superconducting state of K_0.8Fe_1.7Se₂ is phase separated from a non-superconducting magnetic state. These results from a recent neutron diffraction study on a single crystal of K_0.8Fe_1.7Se₂ provide evidence for a continuous transition between the I₄/m m m high temperature phase in which the Fe vacancies are randomly distributed and the I4/m vacancy ordered phase in the temperature range between T (C) and T (S). Upon cooling, the I₄/m phase becomes more populated, increasing the √5 X√5 X 1 superlattice structure, resulting in an enhancement of the (101) superlattice peak. Moreover, the same temperature dependence is observed for the magnetic peak as well. Moreover, due to the Fe site splitting with the transition, its z-coordinate fluctuates, and so must the d _xz and d _{y z} orbitals. Finally, the orbital fluctuations couple to the magnetic ordering as seen here and may lead to a realization of nematic order in this system.

Authors:

Duan, Chunruo ^[1]; Yang, Junjie ^[1]; Ye, Feng ^[2]; Louca, Despina ^[1]

Univ. of Virginia, Charlottesville, VA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Publication Date:: Fri Dec 11 00:00:00 EST 2015

Research Org.:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Org.:: USDOE

OSTI Identifier:: 1324169

Grant/Contract Number:: AC05-00OR22725

Resource Type:: Accepted Manuscript

Journal Name:: Journal of Superconductivity and Novel Magnetism

Additional Journal Information:: Journal Volume: 29; Journal Issue: 3; Journal ID: ISSN 1557-1939

Publisher:: Springer

Country of Publication:: United States

Language:: English

Subject:: 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Superconductivity; Neutron scattering; Vacancies; Nematic phase; KXFE2-YSE2

Citation Formats


                    Duan, Chunruo, Yang, Junjie, Ye, Feng, and Louca, Despina. Evidence of Nematicity in K0.8Fe1.7Se2.  United States: N. p., 2015. 
Web.  doi:10.1007/s10948-015-3327-8.

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                    Duan, Chunruo, Yang, Junjie, Ye, Feng, & Louca, Despina. Evidence of Nematicity in K0.8Fe1.7Se2.  United States.  https://doi.org/10.1007/s10948-015-3327-8

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                    Duan, Chunruo, Yang, Junjie, Ye, Feng, and Louca, Despina. Fri .  
"Evidence of Nematicity in K0.8Fe1.7Se2".  United States.  https://doi.org/10.1007/s10948-015-3327-8.  https://www.osti.gov/servlets/purl/1324169.

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@article{osti_1324169,

  title        = {Evidence of Nematicity in K0.8Fe1.7Se2},

  author       = {Duan, Chunruo and Yang, Junjie and Ye, Feng and Louca, Despina},

  abstractNote = {We proposed that the superconducting state of K0.8Fe1.7Se2 is phase separated from a non-superconducting magnetic state. These results from a recent neutron diffraction study on a single crystal of K0.8Fe1.7Se2 provide evidence for a continuous transition between the I4/m m m high temperature phase in which the Fe vacancies are randomly distributed and the I4/m vacancy ordered phase in the temperature range between T (C) and T (S). Upon cooling, the I4/m phase becomes more populated, increasing the √5 X√5 X 1 superlattice structure, resulting in an enhancement of the (101) superlattice peak. Moreover, the same temperature dependence is observed for the magnetic peak as well. Moreover, due to the Fe site splitting with the transition, its z-coordinate fluctuates, and so must the d xz and d y z orbitals. Finally, the orbital fluctuations couple to the magnetic ordering as seen here and may lead to a realization of nematic order in this system.},

  doi          = {10.1007/s10948-015-3327-8},

  journal      = {Journal of Superconductivity and Novel Magnetism},

  number       = 3,

  volume       = 29,

  place        = {United States},

  year         = {Fri Dec 11 00:00:00 EST 2015},

  month        = {Fri Dec 11 00:00:00 EST 2015}

}

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Title: Evidence of Nematicity in K0.8Fe1.7Se2

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Title: Evidence of Nematicity in K_0.8Fe_1.7Se₂