Unified description of superconducting pairing symmetry in electron-doped Fe-based-122 compounds

Li, Bo; Pan, Lihua; Tai, Yuan-Yen; Graf, Matthias J.; Zhu, Jian-Xin; Bassler, Kevin E.; Ting, C. S.

doi:10.1103/PhysRevB.91.220509

Title: Unified description of superconducting pairing symmetry in electron-doped Fe-based-122 compounds

Abstract

Here, the pairing symmetry is examined in highly electron-doped Ba (Fe_1-x Co_x As)₂ and A_y Fe₂ Se₂ (with A = K, Cs) compounds, with similar crystallographic and electronic band structures. Starting from a phenomenological two-orbital model, we consider nearest-neighbor and next-nearest-neighbor intraorbital pairing interactions on the Fe square lattice. In this model, we find a unified description of the evolution from s_±-wave pairing (2.0 < n ≲ 2.4) to d-wave pairing (2.4 ≲ n ≲ 2.5) as a function of electron filling. In the crossover region, a time-reversal symmetry breaking s_± + id pairing state emerges. This minimal model offers an overall picture of the evolution of superconductivity with electron doping for both s_±-wave and d-wave pairings, as long as the dopants only play the role of a charge reservoir. However, the situation is more complicated for Ba (Fe_1-x Co_x As)₂. A real-space study further shows that when the impurity scattering effects of Co dopants are taken into account, the superconductivity is completely suppressed for n > 2.4. This preempts any observation of d-wave pairing in this compound, in contrast to A_y Fe₂ Se₂ with 0.8 < y < 1.0.

Authors:

Li, Bo ^[1]; Pan, Lihua ^[2]; Tai, Yuan-Yen ^[3];

^[3];

^[3]; Bassler, Kevin E. ^[1]; Ting, C. S. ^[1]

Univ. of Houston, TX (United States). Dept. of Physics and Texas Center for Superconductivity
Univ. of Houston, TX (United States). Dept. of Physics and Texas Center for Superconductivity; Yangzhou Univ. (China). School of Physics Science and Technology
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Publication Date:: Fri Jun 26 00:00:00 EDT 2015

Research Org.:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division; USDOE National Nuclear Security Administration (NNSA); USDOE Laboratory Directed Research and Development (LDRD) Program; National Science Foundation (NSF); Robert A. Welch Foundation

OSTI Identifier:: 1457233

Alternate Identifier(s):: OSTI ID: 1198527

Report Number(s):: LA-UR-15-22100
Journal ID: ISSN 1098-0121; PRBMDO; TRN: US1901318

Grant/Contract Number:: AC52-06NA25396; DMR-1206839; E-1146

Resource Type:: Accepted Manuscript

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

Additional Journal Information:: Journal Volume: 91; Journal Issue: 22; 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


                    Li, Bo, Pan, Lihua, Tai, Yuan-Yen, Graf, Matthias J., Zhu, Jian-Xin, Bassler, Kevin E., and Ting, C. S. Unified description of superconducting pairing symmetry in electron-doped Fe-based-122 compounds.  United States: N. p., 2015. 
Web.  doi:10.1103/PhysRevB.91.220509.

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                    Li, Bo, Pan, Lihua, Tai, Yuan-Yen, Graf, Matthias J., Zhu, Jian-Xin, Bassler, Kevin E., & Ting, C. S. Unified description of superconducting pairing symmetry in electron-doped Fe-based-122 compounds.  United States.  https://doi.org/10.1103/PhysRevB.91.220509

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                    Li, Bo, Pan, Lihua, Tai, Yuan-Yen, Graf, Matthias J., Zhu, Jian-Xin, Bassler, Kevin E., and Ting, C. S. Fri .  
"Unified description of superconducting pairing symmetry in electron-doped Fe-based-122 compounds".  United States.  https://doi.org/10.1103/PhysRevB.91.220509.  https://www.osti.gov/servlets/purl/1457233.

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@article{osti_1457233,

  title        = {Unified description of superconducting pairing symmetry in electron-doped Fe-based-122 compounds},

  author       = {Li, Bo and Pan, Lihua and Tai, Yuan-Yen and Graf, Matthias J. and Zhu, Jian-Xin and Bassler, Kevin E. and Ting, C. S.},

  abstractNote = {Here, the pairing symmetry is examined in highly electron-doped Ba (Fe1-x Cox As)2 and Ay Fe2 Se2 (with A = K, Cs) compounds, with similar crystallographic and electronic band structures. Starting from a phenomenological two-orbital model, we consider nearest-neighbor and next-nearest-neighbor intraorbital pairing interactions on the Fe square lattice. In this model, we find a unified description of the evolution from s±-wave pairing (2.0 < n ≲ 2.4) to d-wave pairing (2.4 ≲ n ≲ 2.5) as a function of electron filling. In the crossover region, a time-reversal symmetry breaking s± + id pairing state emerges. This minimal model offers an overall picture of the evolution of superconductivity with electron doping for both s±-wave and d-wave pairings, as long as the dopants only play the role of a charge reservoir. However, the situation is more complicated for Ba (Fe1-x Cox As)2. A real-space study further shows that when the impurity scattering effects of Co dopants are taken into account, the superconductivity is completely suppressed for n > 2.4. This preempts any observation of d-wave pairing in this compound, in contrast to Ay Fe2 Se2 with 0.8 < y < 1.0.},

  doi          = {10.1103/PhysRevB.91.220509},

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

  number       = 22,

  volume       = 91,

  place        = {United States},

  year         = {Fri Jun 26 00:00:00 EDT 2015},

  month        = {Fri Jun 26 00:00:00 EDT 2015}

}

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https://doi.org/10.1103/PhysRevB.91.220509

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Cited by: 2 works

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Figures / Tables:

FIG. 1: (Color online) SC and AFM phase diagram at T = 0K for uniformly doped A_yFe₂Se₂ and Ba(Fe_1-xCo$_x$As)₂ as a function of the averaged electron number per site $n$, with NN pairing $V_{NN}$ interaction chosen to be (a) 1.1 (b) 1.2 and (c) 1.3. Black squares, red and bluemore »

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Title: Unified description of superconducting pairing symmetry in electron-doped Fe-based-122 compounds

Abstract

Citation Formats

Figures / Tables:

Functional Renormalization-Group Study of the Pairing Symmetry and Pairing Mechanism of the FeAs-Based High-Temperature Superconductor journal, January 2009

Spin fluctuations, interband coupling and unconventional pairing in iron-based superconductors journal, February 2009

Local Electronic Structure of a Single Nonmagnetic Impurity as a Test of the Pairing Symmetry of Electrons in ( K , Tl ) Fe x Se 2 Superconductors journal, October 2011

Interpocket Pairing and Gap Symmetry in Fe-Based Superconductors with Only Electron Pockets journal, June 2012

Nodeless superconducting gap in AxFe2Se2 (A=K,Cs) revealed by angle-resolved photoemission spectroscopy journal, February 2011

Neutron scattering study of the interplay between structure and magnetism in Ba ( Fe 1 − x Co x ) 2 As 2 journal, April 2009

Stripes, spin resonance, and nodeless d -wave pairing symmetry in Fe 2 Se 2 -based layered superconductors journal, July 2011

Single nonmagnetic impurity resonance in FeSe-based 122-type superconductors as a probe for pairing symmetry journal, March 2013

Electronic structure, topological phase transitions and superconductivity in (K, Cs) x Fe2Se2 journal, April 2011

Unconventional Superconductivity with a Sign Reversal in the Order Parameter of LaFeAsO 1 − x F x journal, July 2008

Evolution of the Fermi surface topology in doped 122 iron pnictides journal, December 2013

Modulated superconductivity due to vacancy and magnetic order in A y Fe 2 − x / 2 Se 2 [ A = Cs , K, (Tl,Rb), (Tl,K)] iron-selenide superconductors journal, September 2011

Nonmagnetic Impurity Resonances as a Signature of Sign-Reversal Pairing in FeAs-Based Superconductors journal, October 2009

Calculated phase diagram of doped BaFe 2 As 2 superconductor in a C 4 -symmetry breaking model journal, September 2013

Canonical Entropy and Phase Transition of Rotating Black Hole journal, July 2008

The peculiar physical properties and phase diagram of BaFe 2- x Co x As 2 single crystals journal, April 2009

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Iron-Based Layered Superconductor La[O 1- x F x ]FeAs ( x = 0.05−0.12) with T c = 26 K journal, March 2008

Unconventional Pairing Originating from the Disconnected Fermi Surfaces of Superconducting LaFeAsO 1 − x F x journal, August 2008

Coexistence of Competing Antiferromagnetic and Superconducting Phases in the Underdoped Ba ( Fe 0.953 Co 0.047 ) 2 As 2 Compound Using X-ray and Neutron Scattering Techniques journal, August 2009

Dependence of Carrier Doping on the Impurity Potential in Transition-Metal-Substituted FeAs-Based Superconductors journal, March 2013

Superconductivity and magnetic properties of single crystals of K 0 . 75 Fe 1 . 66 Se 2 and Cs 0 . 81 Fe 1 . 61 Se 2 journal, June 2011

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Electronic structure and Fermi surface of new K intercalated iron selenide superconductor KxFe2Se2 journal, February 2011

Spin-density wave and asymmetry of coherence peaks in iron pnictide superconductors from a two-orbital model journal, February 2010

Superconductivity in the iron selenide K x Fe 2 Se 2 ( 0 ≤ x ≤ 1.0 ) journal, November 2010

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d -wave pairing from spin fluctuations in the K x Fe 2 − y Se 2 superconductors journal, March 2011

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Disorder effects in multiorbital s ± -wave superconductors: Implications for Zn-doped BaFe 2 As 2 compounds journal, November 2013

High current superconductivity in FeSe0.5Te0.5-coated conductors at 30 tesla journal, January 2013

NMR Study in the Iron-Selenide Rb 0.74 Fe 1.6 Se 2 : Determination of the Superconducting Phase as Iron Vacancy-Free Rb 0.3 Fe 2 Se 2 journal, June 2012

Pairing Symmetry in a Two-Orbital Exchange Coupling Model of Oxypnictides journal, November 2008

Electronic and magnetic structures of the ternary iron selenides A Fe 2 Se 2 ( A = Cs , Rb, K, or Tl) journal, August 2011

Electronic structure of heavily electron-doped BaFe 1.7 Co 0.3 As 2 studied by angle-resolved photoemission journal, February 2009

Superconductivity at 41 K and Its Competition with Spin-Density-Wave Instability in Layered CeO 1 − x F x FeAs journal, June 2008

Superconductivity at 43 K in SmFeAsO1-xF x journal, May 2008

Fermi surfaces and phase stability of Ba( Fe 1 − x M x ) 2 As 2 ( M = Co , Ni , Cu , Zn ) journal, May 2014

Phase separation and magnetic order in K-doped iron selenide superconductor journal, November 2011

Density functional study of the overdoped iron chalcogenide TlFe 2 Se 2 with ThCr 2 Si 2 structure journal, March 2009

Evolution of quasiparticle states with and without a Zn impurity in doped 122 iron pnictides journal, October 2014

Spin fluctuations and superconductivity in K x Fe 2 − y Se 2 journal, September 2013

The coevolutionary ultimatum game journal, February 2011

Functional Renormalization-Group Study of the Pairing Symmetry and Pairing Mechanism of the FeAs-Based High-Temperature Superconductor
journal, January 2009

Spin fluctuations, interband coupling and unconventional pairing in iron-based superconductors
journal, February 2009

Local Electronic Structure of a Single Nonmagnetic Impurity as a Test of the Pairing Symmetry of Electrons in $(K, Tl) {Fe}_{x} {Se}_{2}$ Superconductors
journal, October 2011

Interpocket Pairing and Gap Symmetry in Fe-Based Superconductors with Only Electron Pockets
journal, June 2012

Nodeless superconducting gap in AxFe2Se2 (A=K,Cs) revealed by angle-resolved photoemission spectroscopy
journal, February 2011

Neutron scattering study of the interplay between structure and magnetism in $Ba {({Fe}_{1 - x} {Co}_{x})}_{2} {As}_{2}$
journal, April 2009

Stripes, spin resonance, and nodeless $d$ -wave pairing symmetry in Fe $_{2}$ Se $_{2}$ -based layered superconductors
journal, July 2011

Single nonmagnetic impurity resonance in FeSe-based 122-type superconductors as a probe for pairing symmetry
journal, March 2013

Electronic structure, topological phase transitions and superconductivity in (K, Cs) x Fe2Se2
journal, April 2011

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

Evolution of the Fermi surface topology in doped 122 iron pnictides
journal, December 2013

Modulated superconductivity due to vacancy and magnetic order in $A_{y}$ Fe $_{2 - x / 2}$ Se $_{2}$ [ $A = Cs$ , K, (Tl,Rb), (Tl,K)] iron-selenide superconductors
journal, September 2011

Nonmagnetic Impurity Resonances as a Signature of Sign-Reversal Pairing in FeAs-Based Superconductors
journal, October 2009

Calculated phase diagram of doped BaFe ₂ As ₂ superconductor in a C ₄ -symmetry breaking model
journal, September 2013

Canonical Entropy and Phase Transition of Rotating Black Hole
journal, July 2008

The peculiar physical properties and phase diagram of BaFe _{2- x} Co _x As ₂ single crystals
journal, April 2009

Magnetic order close to superconductivity in the iron-based layered LaO1-xF x FeAs systems
journal, May 2008

Iron-Based Layered Superconductor La[O _1- _x F _x ]FeAs ( x = 0.05−0.12) with T _c = 26 K
journal, March 2008

Unconventional Pairing Originating from the Disconnected Fermi Surfaces of Superconducting ${LaFeAsO}_{1 - x} F_{x}$
journal, August 2008

Coexistence of Competing Antiferromagnetic and Superconducting Phases in the Underdoped $Ba ({Fe}_{0.953} {Co}_{0.047})_{2} {As}_{2}$ Compound Using X-ray and Neutron Scattering Techniques
journal, August 2009

Dependence of Carrier Doping on the Impurity Potential in Transition-Metal-Substituted FeAs-Based Superconductors
journal, March 2013

Superconductivity and magnetic properties of single crystals of $K_{0.75}$ Fe $_{1.66}$ Se $_{2}$ and Cs $_{0.81}$ Fe $_{1.61}$ Se $_{2}$
journal, June 2011

Magnetic domain walls induced by twin boundaries in low doped Fe-pnictides
journal, October 2013

Observation of superconductivity at 30∼46K in AxFe2Se2(A = Li, Na, Ba, Sr, Ca, Yb and Eu)
journal, May 2012

Electronic structure and Fermi surface of new K intercalated iron selenide superconductor KxFe2Se2
journal, February 2011

Spin-density wave and asymmetry of coherence peaks in iron pnictide superconductors from a two-orbital model
journal, February 2010

Superconductivity in the iron selenide $K_{x} {Fe}_{2} {Se}_{2}$ $(0 \leq x \leq 1.0)$
journal, November 2010

Mechanism for a pairing state with time-reversal symmetry breaking in iron-based superconductors
journal, May 2012

$d$ -wave pairing from spin fluctuations in the $K_{x}$ Fe $_{2 - y}$ Se $_{2}$ superconductors
journal, March 2011

Atomic coexistence of superconductivity and incommensurate magnetic order in the pnictide $Ba {({Fe}_{1 - x} {Co}_{x})}_{2} {As}_{2}$
journal, October 2009

Electronic Structure of KFe ₂ Se ₂ from First-Principles Calculations
journal, May 2011

Disorder effects in multiorbital $s_{\pm}$ -wave superconductors: Implications for Zn-doped BaFe $_{2}$ As $_{2}$ compounds
journal, November 2013

High current superconductivity in FeSe0.5Te0.5-coated conductors at 30 tesla
journal, January 2013

NMR Study in the Iron-Selenide ${Rb}_{0.74} {Fe}_{1.6} {Se}_{2}$ : Determination of the Superconducting Phase as Iron Vacancy-Free ${Rb}_{0.3} {Fe}_{2} {Se}_{2}$
journal, June 2012

Pairing Symmetry in a Two-Orbital Exchange Coupling Model of Oxypnictides
journal, November 2008

Electronic and magnetic structures of the ternary iron selenides $A$ Fe $_{2}$ Se $_{2}$ ( $A = Cs$ , Rb, K, or Tl)
journal, August 2011

Electronic structure of heavily electron-doped BaFe _1.7 Co _0.3 As ₂ studied by angle-resolved photoemission
journal, February 2009

Superconductivity at 41 K and Its Competition with Spin-Density-Wave Instability in Layered ${CeO}_{1 - x} F_{x} FeAs$
journal, June 2008

Superconductivity at 43 K in SmFeAsO1-xF x
journal, May 2008

Fermi surfaces and phase stability of Ba( ${Fe}_{1 - x} M_{x})_{2}$ ${As}_{2}$ ( $M = Co, Ni, Cu, Zn$ )
journal, May 2014

Phase separation and magnetic order in K-doped iron selenide superconductor
journal, November 2011

Density functional study of the overdoped iron chalcogenide ${TlFe}_{2} {Se}_{2}$ with ${ThCr}_{2} {Si}_{2}$ structure
journal, March 2009

Evolution of quasiparticle states with and without a Zn impurity in doped 122 iron pnictides
journal, October 2014

Spin fluctuations and superconductivity in K $_{x}$ Fe $_{2 - y}$ Se $_{2}$
journal, September 2013

The coevolutionary ultimatum game
journal, February 2011