Appearance of superconductivity at the vacancy order-disorder boundary in KxFe2-ySe2

Duan, Chunruo; Yang, Junjie; Ren, Yang; Thomas, Sean Michael; Louca, Despina

doi:10.1103/PhysRevB.97.184502

Title: Appearance of superconductivity at the vacancy order-disorder boundary in $K_{x} {Fe}_{2 - y} {Se}_{2}$

Abstract

The role of phase separation and the effect of Fe-vacancy ordering in the emergence of superconductivity in alkali metal doped iron selenides A(x)Fe(2-y)Se(2) (A = K, Rb, Cs) is explored. High energy x-ray diffraction and Monte Carlo simulation were used to investigate the crystal structure of quenched superconducting (SC) and as-grown nonsuperconducting (NSC) KxFe2-ySe2 single crystals. The coexistence of superlattice structures with the in-plane root 2 x root 2 K-vacancy ordering and the root 5 x root 5 Fe-vacancy ordering were observed in both the SC and NSC crystals alongside the I4/mmm Fe-vacancy-free phase. Moreover, in the SC crystals, an Fevacancy-disordered phase is additionally proposed to be present. Monte Carlo simulations suggest that it appears at the boundary between the I4/mmm vacancy-free phase and the I4/m vacancy-ordered phases (root 5 x root 5). The vacancy-disordered phase is nonmagnetic and is most likely the host of superconductivity.

Authors:

Duan, Chunruo ^[1]; Yang, Junjie ^[1]; Ren, Yang ^[2];

^[3]; Louca, Despina ^[1]

Univ. of Virginia, Charlottesville, VA (United States)
Argonne National Lab. (ANL), Argonne, IL (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Publication Date:: Mon May 14 00:00:00 EDT 2018

Research Org.:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Org.:: USDOE Office of Science (SC). Basic Energy Sciences (BES) (SC-22); USDOE; USDOE Office of Science - Office of Basic Energy Sciences - Scientific User Facilities Division

OSTI Identifier:: 1471306

Alternate Identifier(s):: OSTI ID: 1437075; OSTI ID: 1473670

Report Number(s):: LA-UR-18-28713
Journal ID: ISSN 2469-9950; PRBMDO

Grant/Contract Number:: AC52-06NA25396; FG02-01ER45927; AC02-06CH11357

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review B

Additional Journal Information:: Journal Volume: 97; Journal Issue: 18; Journal ID: ISSN 2469-9950

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

Subject:: 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE

Citation Formats


                    Duan, Chunruo, Yang, Junjie, Ren, Yang, Thomas, Sean Michael, and Louca, Despina. Appearance of superconductivity at the vacancy order-disorder boundary in KxFe2-ySe2.  United States: N. p., 2018. 
Web.  doi:10.1103/PhysRevB.97.184502.

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                    Duan, Chunruo, Yang, Junjie, Ren, Yang, Thomas, Sean Michael, & Louca, Despina. Appearance of superconductivity at the vacancy order-disorder boundary in KxFe2-ySe2.  United States.  https://doi.org/10.1103/PhysRevB.97.184502

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                    Duan, Chunruo, Yang, Junjie, Ren, Yang, Thomas, Sean Michael, and Louca, Despina. Mon .  
"Appearance of superconductivity at the vacancy order-disorder boundary in KxFe2-ySe2".  United States.  https://doi.org/10.1103/PhysRevB.97.184502.  https://www.osti.gov/servlets/purl/1471306.

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@article{osti_1471306,

  title        = {Appearance of superconductivity at the vacancy order-disorder boundary in KxFe2-ySe2},

  author       = {Duan, Chunruo and Yang, Junjie and Ren, Yang and Thomas, Sean Michael and Louca, Despina},

  abstractNote = {The role of phase separation and the effect of Fe-vacancy ordering in the emergence of superconductivity in alkali metal doped iron selenides A(x)Fe(2-y)Se(2) (A = K, Rb, Cs) is explored. High energy x-ray diffraction and Monte Carlo simulation were used to investigate the crystal structure of quenched superconducting (SC) and as-grown nonsuperconducting (NSC) KxFe2-ySe2 single crystals. The coexistence of superlattice structures with the in-plane root 2 x root 2 K-vacancy ordering and the root 5 x root 5 Fe-vacancy ordering were observed in both the SC and NSC crystals alongside the I4/mmm Fe-vacancy-free phase. Moreover, in the SC crystals, an Fevacancy-disordered phase is additionally proposed to be present. Monte Carlo simulations suggest that it appears at the boundary between the I4/mmm vacancy-free phase and the I4/m vacancy-ordered phases (root 5 x root 5). The vacancy-disordered phase is nonmagnetic and is most likely the host of superconductivity.},

  doi          = {10.1103/PhysRevB.97.184502},

  journal      = {Physical Review B},

  number       = 18,

  volume       = 97,

  place        = {United States},

  year         = {Mon May 14 00:00:00 EDT 2018},

  month        = {Mon May 14 00:00:00 EDT 2018}

}

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https://doi.org/10.1103/PhysRevB.97.184502

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Cited by: 2 works

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Figures / Tables:

FIG. 1: The diffraction patterns from the hk0 plane from (a) as-grown and (b) quenched crystals. In (c) and (d) are the plots along the 00l direction in the as-grown and quenched crystal, respectively. The hk0 patterns consist of two configurations of the I4/m phase highlighted by the two innermore »

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Works referencing / citing this record:

Multiple Electronic Components and Lifshitz Transitions by Oxygen Wires Formation in Layered Cuprates and Nickelates
journal, January 2019

Jarlborg, Thomas; Bianconi, Antonio
Condensed Matter, Vol. 4, Issue 1
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Fermi-Bose Mixtures and BCS-BEC Crossover in High-Tc Superconductors
journal, June 2019

Kagan, Maxim Yu.; Bianconi, Antonio
Condensed Matter, Vol. 4, Issue 2
DOI: 10.3390/condmat4020051

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Title: Appearance of superconductivity at the vacancy order-disorder boundary in K x Fe 2 - y Se 2

Abstract

Citation Formats

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Title: Appearance of superconductivity at the vacancy order-disorder boundary in $K_{x} {Fe}_{2 - y} {Se}_{2}$

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