Excess-iron driven spin glass phase in Fe1 + yTe1 – xSex

Tian, Long; Liu, Panpan; Hong, Tao; Seydel, Tilo; Lu, Xingye; Luo, Huiqian; Li, Shiliang; Dai, Pengcheng

doi:10.1088/1674-1056/ac0695

Title: Excess-iron driven spin glass phase in Fe_{1 + y}Te_{1 – x}Se_x

Abstract

The iron-chalcogenide superconductor FeTe_1–xSe_x displays a variety of exotic features distinct from iron pnictides. Although much effort has been devoted to understanding the interplay between magnetism and superconductivity near x = 0.5, the existence of a spin glass phase with short-range magnetic order in the doping range (x ~ 0.1–0.3) has rarely been studied. Here, we use DC/AC magnetization and (quasi) elastic neutron scattering to confirm the spin-glass nature of the short-range magnetic order in a Fe_1.07Te_0.8Se_0.2 sample. The AC-frequency dependent spin-freezing temperature T_f generates a frequency sensitivity ΔT_f(ω)/[T_f(ω)Δlog₁₀ ω] ≈ 0.028 and the description of the critical slowing down with τ = τ₀(T_f/T_SG – 1)^{-z v} gives T_SG ≈ 22 K and zv ≈ 10, comparable to that of a classical spin-glass system. We have also extended the frequency-dependent T_f to the smaller time scale using energy-resolution-dependent neutron diffraction measurements, in which the T_N of the short-range magnetic order increases systematically with increasing energy resolution. We find that by removing the excess iron through annealing in oxygen, the spin-freezing behavior disappears, and bulk superconductivity is realized. Thus, the excess Fe is the driving force for the formation of the spin-glass phase detrimental to bulk superconductivity.

Authors:

Tian, Long ^[1]; Liu, Panpan ^[1];

^[2]; Seydel, Tilo ^[3]; Lu, Xingye ^[1]; Luo, Huiqian ^[4]; Li, Shiliang ^[4]; Dai, Pengcheng ^[5]

Beijing Normal Univ. (China). Center for Advanced Quantum Studies
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Inst. Max von Laue-Paul Langevin, Grenoble (France)
Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics. Beijing National Lab. for Condensed Matter Physics (BNLCP-CAS)
Rice Univ., Houston, TX (United States)

Publication Date:: Fri May 07 00:00:00 EDT 2021

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

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Natural Science Foundation of China (NSFC)

OSTI Identifier:: 1817489

Grant/Contract Number:: AC05-00OR22725; 11734002; 11922402; SC0012311

Resource Type:: Accepted Manuscript

Journal Name:: Chinese Physics B

Additional Journal Information:: Journal Volume: 30; Journal Issue: 8; Journal ID: ISSN 1674-1056

Publisher:: IOP Publishing

Country of Publication:: United States

Language:: English

Subject:: 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; iron chalcogenides; spin glass; neutron scattering

Citation Formats


                    Tian, Long, Liu, Panpan, Hong, Tao, Seydel, Tilo, Lu, Xingye, Luo, Huiqian, Li, Shiliang, and Dai, Pengcheng. Excess-iron driven spin glass phase in Fe1 + yTe1 – xSex.  United States: N. p., 2021. 
Web.  doi:10.1088/1674-1056/ac0695.

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                    Tian, Long, Liu, Panpan, Hong, Tao, Seydel, Tilo, Lu, Xingye, Luo, Huiqian, Li, Shiliang, & Dai, Pengcheng. Excess-iron driven spin glass phase in Fe1 + yTe1 – xSex.  United States.  https://doi.org/10.1088/1674-1056/ac0695

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                    Tian, Long, Liu, Panpan, Hong, Tao, Seydel, Tilo, Lu, Xingye, Luo, Huiqian, Li, Shiliang, and Dai, Pengcheng. Fri .  
"Excess-iron driven spin glass phase in Fe1 + yTe1 – xSex".  United States.  https://doi.org/10.1088/1674-1056/ac0695.  https://www.osti.gov/servlets/purl/1817489.

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@article{osti_1817489,

  title        = {Excess-iron driven spin glass phase in Fe1 + yTe1 – xSex},

  author       = {Tian, Long and Liu, Panpan and Hong, Tao and Seydel, Tilo and Lu, Xingye and Luo, Huiqian and Li, Shiliang and Dai, Pengcheng},

  abstractNote = {The iron-chalcogenide superconductor FeTe1–xSex displays a variety of exotic features distinct from iron pnictides. Although much effort has been devoted to understanding the interplay between magnetism and superconductivity near x = 0.5, the existence of a spin glass phase with short-range magnetic order in the doping range (x ~ 0.1–0.3) has rarely been studied. Here, we use DC/AC magnetization and (quasi) elastic neutron scattering to confirm the spin-glass nature of the short-range magnetic order in a Fe1.07Te0.8Se0.2 sample. The AC-frequency dependent spin-freezing temperature Tf generates a frequency sensitivity ΔTf(ω)/[Tf(ω)Δlog10 ω] ≈ 0.028 and the description of the critical slowing down with τ = τ0(Tf/TSG – 1)-z v gives TSG ≈ 22 K and zv ≈ 10, comparable to that of a classical spin-glass system. We have also extended the frequency-dependent Tf to the smaller time scale using energy-resolution-dependent neutron diffraction measurements, in which the TN of the short-range magnetic order increases systematically with increasing energy resolution. We find that by removing the excess iron through annealing in oxygen, the spin-freezing behavior disappears, and bulk superconductivity is realized. Thus, the excess Fe is the driving force for the formation of the spin-glass phase detrimental to bulk superconductivity.},

  doi          = {10.1088/1674-1056/ac0695},

  journal      = {Chinese Physics B},

  number       = 8,

  volume       = 30,

  place        = {United States},

  year         = {Fri May 07 00:00:00 EDT 2021},

  month        = {Fri May 07 00:00:00 EDT 2021}

}

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Title: Excess-iron driven spin glass phase in Fe1 + yTe1 – xSex

Abstract

Citation Formats

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Title: Excess-iron driven spin glass phase in Fe_{1 + y}Te_{1 – x}Se_x

First-Principles Calculations of the Electronic Structure of Tetragonal $α$ -FeTe and $α$ -FeSe Crystals: Evidence for a Bicollinear Antiferromagnetic Order
journal, April 2009

Growth, Annealing Effects on Superconducting and Magnetic Properties, and Anisotropy of FeSe _{1- x} Te _x (0.5≤ x ≤1) Single Crystals
journal, August 2010

Superconducting glass-phase diagram for ceramic YBa2Cu 3O7-δ
journal, January 1989

From (π,0) magnetic order to superconductivity with (π,π) magnetic resonance in Fe1.02Te1−xSex
journal, July 2010

Recent experiments about the spin-glass transition
journal, November 1984

Not all iron superconductors are the same
journal, July 2009

Magnetic excitations in pure, lightly doped, and weakly metallic ${La}_{2}$ ${CuO}_{4}$
journal, December 1992

Disappearance of static magnetic order and evolution of spin fluctuations in ${Fe}_{1 + δ} {Se}_{x} {Te}_{1 - x}$
journal, September 2010

Effects of Annealing under Tellurium Vapor for Fe _1.03 Te _0.8 Se _0.2 Single Crystals
journal, February 2013

Coexistence of superconductivity and short-range double-stripe spin correlations in Te-vapor annealed ${FeTe}_{1 - x} {Se}_{x}$ ( $x \leq 0.2$ )
journal, June 2018

Spin-glass evolution behavior in spinel compounds Co2-Zn SnO4 (0 ≤ x ≤ 1)
journal, January 2021

Dynamical behavior of the susceptibility around the freezing temperature in (Eu,Sr)S
journal, March 1983

Short-range cluster spin glass near optimal superconductivity in $Ba {Fe}_{2 - x} {Ni}_{x} {As}_{2}$
journal, July 2014

Neutron-Scattering Measurement of the Edwards-Anderson Order Parameter for a $Cu$ -Mn Spin-Glass Alloy
journal, November 1978

Nearly quantized conductance plateau of vortex zero mode in an iron-based superconductor
journal, December 2019

Incommensurate itinerant antiferromagnetic excitations and spin resonance in the ${FeTe}_{0.6} {Se}_{0.4}$ superconductor
journal, June 2010

Tuning the superconducting and magnetic properties of ${Fe}_{y} {Se}_{0.25} {Te}_{0.75}$ by varying the iron content
journal, December 2010

Bulk Superconductivity in Fe ₁₊ _y Te _0.6 Se _0.4 Induced by Removal of Excess Fe
journal, June 2014

Theory of magnetic order in Fe _{1+ y} Te _{1- x} Se _x
journal, June 2009

Susceptibility of the $Cu Mn$ spin-glass: Frequency and field dependences
journal, February 1981

Interplay between magnetism and superconductivity in iron-chalcogenide superconductors: crystal growth and characterizations
journal, September 2011

Neutron scattering study of spin density wave and weak ferromagnetic orders in ${T b}_{0.47} Y_{0.53} {N i}_{2}^{11} B_{2} C$
journal, December 2018

Tunable ( $δ π$ , $δ π$ )-Type Antiferromagnetic Order in $α$ -Fe(Te,Se) Superconductors
journal, June 2009

Theory of dynamic critical phenomena
journal, July 1977

Coexistence of incommensurate magnetism and superconductivity in ${Fe}_{1 + y} {Se}_{x} {Te}_{1 - x}$
journal, October 2009

Fermi Surface Topology and Low-Lying Quasiparticle Dynamics of Parent ${Fe}_{1 + x} Te / Se$ Superconductor
journal, July 2009

Short-range incommensurate magnetic order near the superconducting phase boundary in ${Fe}_{1 + δ} {Te}_{1 - x} {Se}_{x}$
journal, September 2009

Unconventional Superconductivity with a Sign Reversal in the Order Parameter of ${LaFeAsO}_{1 - x} F_{x}$
journal, July 2008

Muon-spin-relaxation and neutron-scattering studies of magnetism in single-crystal ${La}_{1.94}$ ${Sr}_{0.06}$ ${CuO}_{4}$
journal, May 1990

Electronic properties of single-crystalline ${Fe}_{1.05} Te$ and ${Fe}_{1.03} {Se}_{0.30} {Te}_{0.70}$
journal, April 2009

Dynamics of an Ising Spin-Glass in the Vicinity of the Spin-Glass Temperature
journal, August 1988

Neutron diffraction study of the magnetic and structural phase transitions in ${BaFe}_{2} {As}_{2}$
journal, May 2009

Magnetism in Fe-based superconductors
journal, April 2010

Investigation of the Spin-Glass Regime between the Antiferromagnetic and Superconducting Phases in Fe _{1+ y} Se _x Te _{1- x}
journal, November 2010

Magnetic phase diagram of Fe _1.1 Te _1-x Se _x : A comparative study with the stoichiometric superconducting FeTe _1-x Se _x system
journal, April 2010

Observation of topological superconductivity on the surface of an iron-based superconductor
journal, March 2018

Spin glasses: Experimental facts, theoretical concepts, and open questions
journal, October 1986

Bulk Superconductivity in Fe _{1+ y} Te _{1- x} Se _x Induced by Annealing in Se and S Vapor
journal, November 2013

Critical slowing down in spin glasses and other glasses: Fulcher versus power law
journal, July 1985

First-order magnetic and structural phase transitions in ${Fe}_{1 + y} {Se}_{x} {Te}_{1 - x}$
journal, February 2009

Revised phase diagram for the FeTe $_{1 - x}$ Se $_{x}$ system with fewer excess Fe atoms
journal, December 2011

Quasielastic neutron scattering study of hydrogen motion in C15-type YMn ₂ H _x
journal, May 2003

Evidence for Majorana bound states in an iron-based superconductor
journal, August 2018

Spectral distribution of relaxation times in spin glasses
journal, February 1981