Neutron spin resonance as a probe of Fermi surface nesting and superconducting gap symmetry in Ba0.67K0.33(Fe1–xCox)2As2

doi:10.1103/PhysRevB.98.060502

Title: Neutron spin resonance as a probe of Fermi surface nesting and superconducting gap symmetry in ${Ba}_{0.67} K_{0.33} {({Fe}_{1 - x} {Co}_{x})}_{2} {As}_{2}$

Abstract

Here, we use inelastic neutron scattering to study the energy and wave-vector dependence of the superconductivity-induced resonance in hole-doped Ba _0.67K _0.33(Fe _1–xCo _x) ₂As ₂ (x=0 and 0.08 with T _c ≈ 37 and 28 K, respectively). In previous work on electron-doped Ba(Fe _0.963Ni _0.037) ₂As ₂ (T _N = 26 K and T _c = 17 K), the resonance is found to peak sharply at the antiferromagnetic (AF) ordering wave vector Q _AF along the longitudinal direction, but disperses upwards away from Q _AF along the transverse direction. For hole-doped x = 0 and 0.08 without AF order, we find that the resonance displays a ringlike upward dispersion away from Q _AF along both the longitudinal and transverse directions. By comparing these results with calculations using the random phase approximation, we conclude that the dispersive resonance is a direct signature of isotropic superconducting gaps arising from nested hole-electron Fermi surfaces.

Authors:

Zhang, Rui N. ^[1]; Wang, Weiyi ^[1];

^[2]; Wang, Meng ^[3];

^[2];

^[2]; Dai, Pengcheng ^[1]

Rice Univ., Houston, TX (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sun Yat-Sen Univ., Guangzhou (China)

Publication Date:: 2018-08-30

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

Sponsoring Org.:: USDOE

OSTI Identifier:: 1468036

Alternate Identifier(s):: OSTI ID: 1467958

Grant/Contract Number:: AC05-00OR22725

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review B

Additional Journal Information:: Journal Volume: 98; Journal Issue: 6; Journal ID: ISSN 2469-9950

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

Subject:: 74 ATOMIC AND MOLECULAR PHYSICS

Citation Formats


                    Zhang, Rui N., Wang, Weiyi, Maier, Thomas A., Wang, Meng, Stone, Matthew B., Chi, Songxue, Winn, Barry L., and Dai, Pengcheng. Neutron spin resonance as a probe of Fermi surface nesting and superconducting gap symmetry in Ba0.67K0.33(Fe1–xCox)2As2.  United States: N. p., 2018. 
        Web.  doi:10.1103/PhysRevB.98.060502.

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                    Zhang, Rui N., Wang, Weiyi, Maier, Thomas A., Wang, Meng, Stone, Matthew B., Chi, Songxue, Winn, Barry L., & Dai, Pengcheng. Neutron spin resonance as a probe of Fermi surface nesting and superconducting gap symmetry in Ba0.67K0.33(Fe1–xCox)2As2.  United States.  doi:10.1103/PhysRevB.98.060502.

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                    Zhang, Rui N., Wang, Weiyi, Maier, Thomas A., Wang, Meng, Stone, Matthew B., Chi, Songxue, Winn, Barry L., and Dai, Pengcheng. Thu .  
        "Neutron spin resonance as a probe of Fermi surface nesting and superconducting gap symmetry in Ba0.67K0.33(Fe1–xCox)2As2".  United States.  doi:10.1103/PhysRevB.98.060502.  https://www.osti.gov/servlets/purl/1468036.

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@article{osti_1468036,

  title        = {Neutron spin resonance as a probe of Fermi surface nesting and superconducting gap symmetry in Ba0.67K0.33(Fe1–xCox)2As2},

  author       = {Zhang, Rui N. and Wang, Weiyi and Maier, Thomas A. and Wang, Meng and Stone, Matthew B. and Chi, Songxue and Winn, Barry L. and Dai, Pengcheng},

  abstractNote = {Here, we use inelastic neutron scattering to study the energy and wave-vector dependence of the superconductivity-induced resonance in hole-doped Ba0.67K0.33(Fe1–xCox)2As2 (x=0 and 0.08 with Tc ≈ 37 and 28 K, respectively). In previous work on electron-doped Ba(Fe0.963Ni0.037)2As2 (TN = 26 K and Tc = 17 K), the resonance is found to peak sharply at the antiferromagnetic (AF) ordering wave vector QAF along the longitudinal direction, but disperses upwards away from QAF along the transverse direction. For hole-doped x = 0 and 0.08 without AF order, we find that the resonance displays a ringlike upward dispersion away from QAF along both the longitudinal and transverse directions. By comparing these results with calculations using the random phase approximation, we conclude that the dispersive resonance is a direct signature of isotropic superconducting gaps arising from nested hole-electron Fermi surfaces.},

  doi          = {10.1103/PhysRevB.98.060502},

  journal      = {Physical Review B},

  number       = 6,

  volume       = 98,

  place        = {United States},

  year         = {2018},

  month        = {8}

}

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DOI: 10.1103/PhysRevB.98.060502

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Title: Neutron spin resonance as a probe of Fermi surface nesting and superconducting gap symmetry in Ba 0.67 K 0.33 ( Fe 1 – x Co x ) 2 As 2

Abstract

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Title: Neutron spin resonance as a probe of Fermi surface nesting and superconducting gap symmetry in ${Ba}_{0.67} K_{0.33} {({Fe}_{1 - x} {Co}_{x})}_{2} {As}_{2}$

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Two-dimensional resonant magnetic excitation in ${BaFe}_{1.84} {Co}_{0.16} {As}_{2}$
journal, March 2009

Transition from Sign-Reversed to Sign-Preserved Cooper-Pairing Symmetry in Sulfur-Doped Iron Selenide Superconductors
journal, May 2016

Theory of neutron scattering as a probe of the superconducting gap in the iron pnictides
journal, July 2008

Progress in Heavy-Fermion Superconductivity: Ce115 and Related Materials
journal, January 2012

Spin fluctuations and superconductivity in a three-dimensional tight-binding model for ${BaFe}_{2} {As}_{2}$
journal, June 2010

Crossover from weak to strong pairing in unconventional superconductors
journal, June 2011

Electron doping evolution of the magnetic excitations in BaFe $_{2 - x}$ Ni $_{x}$ As $_{2}$
journal, October 2013

A Relation between the Resonance Neutron Peak and ARPES Data in Cuprates
journal, August 1999

A universal relationship between magnetic resonance and superconducting gap in unconventional superconductors
journal, October 2009

Magnitude of the Magnetic Exchange Interaction in the Heavy-Fermion Antiferromagnet ${CeRhIn}_{5}$
journal, December 2014

The Spin Excitation Spectrum in Superconducting YBa2Cu3O6.85
journal, May 2000

Spin Resonance in Three-Dimensional Superconductors: The Case of ${CeCoIn}_{5}$
journal, October 2008

Normal-state spin dynamics and temperature-dependent spin-resonance energy in optimally doped BaFe1.85Co0.15As2
journal, December 2009

Gap symmetry and structure of Fe-based superconductors
journal, October 2011

A common thread: The pairing interaction for unconventional superconductors
journal, October 2012

Dispersion of the neutron resonance in cuprate superconductors
journal, April 2001