Sustained phase separation and spin glass in Co-doped KxFe2-ySe2 single crystals

Ryu, Hyejin; Wang, Kefeng; Opacic, M.; Lazarevic, N.; Warren, J. B.; Popovic, Z. V.; Bozin, Emil S.; Petrovic, C.

doi:10.1103/PhysRevB.92.174522

Title: Sustained phase separation and spin glass in Co-doped $K_{x} {Fe}_{2 - y} {Se}_{2}$ single crystals

Abstract

We describe Co substitution effects in K_xFe_2-y-zCo_zSe₂ (0.06 ≤ z ≤ 1.73) single crystal alloys. By 3.5% of Co doping superconductivity is suppressed whereas phase separation of semiconducting K₂Fe₄Se₅ and superconducting/metallic K_xFe₂Se₂ is still present. We show that the arrangement and distribution of superconducting phase (stripe phase) is connected with the arrangement of K, Fe and Co atoms. Semiconducting spin glass is found in proximity to superconducting state, persisting for large Co concentrations. At high Co concentrations ferromagnetic metallic state emerges above the spin glass. This is coincident with changes of the unit cell, arrangement and connectivity of stripe conducting phase.

Authors:

Ryu, Hyejin ^[1]; Wang, Kefeng ^[2]; Opacic, M. ^[3]; Lazarevic, N. ^[3]; Warren, J. B. ^[4]; Popovic, Z. V. ^[4]; Bozin, Emil S. ^[2]; Petrovic, C. ^[1]

Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.; Stony Brook Univ., NY (United States). Dept. of Physics and Astronomy
Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.
Univ. of Belgrade, Belgrade (Serbia)
Brookhaven National Lab. (BNL), Upton, NY (United States)

Publication Date:: Thu Nov 19 00:00:00 EST 2015

Research Org.:: Brookhaven National Laboratory (BNL), Upton, NY (United States); Energy Frontier Research Centers (EFRC) (United States). Center for Emergent Superconductivity (CES)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

OSTI Identifier:: 1240589

Alternate Identifier(s):: OSTI ID: 1546123

Report Number(s):: BNL-111749-2016-JA
Journal ID: ISSN 1098-0121; PRBMDO; R&D Project: PM016; PO011; KC0201050; KC0201060

Grant/Contract Number:: SC0012704; SC00112704

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review. B, Condensed Matter and Materials Physics

Additional Journal Information:: Journal Volume: 92; Journal Issue: 17; Journal ID: ISSN 1098-0121

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

Subject:: 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats


                    Ryu, Hyejin, Wang, Kefeng, Opacic, M., Lazarevic, N., Warren, J. B., Popovic, Z. V., Bozin, Emil S., and Petrovic, C. Sustained phase separation and spin glass in Co-doped KxFe2-ySe2 single crystals.  United States: N. p., 2015. 
Web.  doi:10.1103/PhysRevB.92.174522.

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                    Ryu, Hyejin, Wang, Kefeng, Opacic, M., Lazarevic, N., Warren, J. B., Popovic, Z. V., Bozin, Emil S., & Petrovic, C. Sustained phase separation and spin glass in Co-doped KxFe2-ySe2 single crystals.  United States.  https://doi.org/10.1103/PhysRevB.92.174522

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                    Ryu, Hyejin, Wang, Kefeng, Opacic, M., Lazarevic, N., Warren, J. B., Popovic, Z. V., Bozin, Emil S., and Petrovic, C. Thu .  
"Sustained phase separation and spin glass in Co-doped KxFe2-ySe2 single crystals".  United States.  https://doi.org/10.1103/PhysRevB.92.174522.  https://www.osti.gov/servlets/purl/1240589.

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@article{osti_1240589,

  title        = {Sustained phase separation and spin glass in Co-doped KxFe2-ySe2 single crystals},

  author       = {Ryu, Hyejin and Wang, Kefeng and Opacic, M. and Lazarevic, N. and Warren, J. B. and Popovic, Z. V. and Bozin, Emil S. and Petrovic, C.},

  abstractNote = {We describe Co substitution effects in KxFe2-y-zCozSe2 (0.06 ≤ z ≤ 1.73) single crystal alloys. By 3.5% of Co doping superconductivity is suppressed whereas phase separation of semiconducting K2Fe4Se5 and superconducting/metallic KxFe2Se2 is still present. We show that the arrangement and distribution of superconducting phase (stripe phase) is connected with the arrangement of K, Fe and Co atoms. Semiconducting spin glass is found in proximity to superconducting state, persisting for large Co concentrations. At high Co concentrations ferromagnetic metallic state emerges above the spin glass. This is coincident with changes of the unit cell, arrangement and connectivity of stripe conducting phase.},

  doi          = {10.1103/PhysRevB.92.174522},

  journal      = {Physical Review. B, Condensed Matter and Materials Physics},

  number       = 17,

  volume       = 92,

  place        = {United States},

  year         = {Thu Nov 19 00:00:00 EST 2015},

  month        = {Thu Nov 19 00:00:00 EST 2015}

}

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https://doi.org/10.1103/PhysRevB.92.174522

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Superconductivity Induced by Co-Doping in Quaternary Fluoroarsenide CaFeAsF
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Evolution of bulk superconductivity in ${SrFe}_{2} {As}_{2}$ with Ni substitution
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Substitution Effects on FeSe Superconductor
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77Se-NMR study of Co-substituted FeSe
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Exchange bias in structure-phase separated K0.8Fe2−xNixSe2 (x=0.015) single crystal: Interface evidence
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Absence of a Holelike Fermi Surface for the Iron-Based $K_{0.8} {Fe}_{1.7} {Se}_{2}$ Superconductor Revealed by Angle-Resolved Photoemission Spectroscopy
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A Novel Large Moment Antiferromagnetic Order in K _0.8 Fe _1.6 Se ₂ Superconductor
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Magnetism and its microscopic origin in iron-based high-temperature superconductors
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Two-dimensional detector software: From real detector to idealised image or two-theta scan
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EXPGUI , a graphical user interface for GSAS
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Antiferromagnetism in semiconducting KFe $_{0.85}$ Ag $_{1.15}$ Te $_{2}$ single crystals
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Antiferromagnetic-to-ferromagnetic transition in metallic Tl1−xKxCo2Se2 (0 ⩽ x ⩽ 1.0) with ThCr2Si2-type structure
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Critical exponents of spin-galss systems
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Low-energy bound states at interfaces between superconducting and block antiferromagnetic regions in K $_{x}$ Fe $_{2 - y}$ Se $_{2}$
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Observation of Temperature-Induced Crossover to an Orbital-Selective Mott Phase in $A_{x} {Fe}_{2 − y} {Se}_{2}$ ( $A = K$ , Rb) Superconductors
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Orbital-Selective Mott Phase in Multiorbital Models for Alkaline Iron Selenides $K_{1 - x} {Fe}_{2 - y} {Se}_{2}$
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Mott Transition in Modulated Lattices and Parent Insulator of $(K, Tl)_{y} {Fe}_{x} {Se}_{2}$ Superconductors
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Effective Doping and Suppression of Fermi Surface Reconstruction via Fe Vacancy Disorder in $K_{x} {Fe}_{2 - y} {Se}_{2}$
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Unconventional Mott transition in K $_{x}$ Fe $_{2 - y}$ Se $_{2}$
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Electronic structure of the new Ni-based superconductor KNi ₂ Se ₂
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Glass-induced enhancement of superconducting $T_{c}$ : Pairing via dissipative mediators
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Glass-induced enhancement of superconducting $T_c$: Pairing via dissipative mediators
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