Temperature and polarization dependence of low-energy magnetic fluctuations in nearly optimally doped NaFe0.9785Co0.0215As

doi:https://doi.org/10.1103/PhysRevB.96.184512

Title: Temperature and polarization dependence of low-energy magnetic fluctuations in nearly optimally doped ${NaFe}_{0.9785} {Co}_{0.0215} As$

Abstract

We use unpolarized and polarized neutron scattering to study the temperature and polarization dependence of low-energy magnetic fluctuations in nearly optimally doped NaFe _0.9785Co _0.0215As, with coexisting superconductivity (T _c ≈ 19 K) and weak antiferromagnetic order ( T _N ≈ 30 K, ordered moment ≈ 0.02 μ _B/Fe). A single spin resonance mode with intensity tracking the superconducting order parameter is observed, although energy of the mode only softens slightly upon approaching T _c. Polarized neutron scattering reveals that the single resonance is mostly isotropic in spin space, similar to overdoped NaFe _0.935Co _0.045As but different from optimal electron-, hole-, and isovalently doped BaFe ₂As ₂ compounds, all featuring an additional prominent anisotropic component. Spin anisotropy in NaFe _0.9785Co _0.0215As is instead present at energies below the resonance, which becomes partially gapped below T _c, similar to the situation in optimally doped YBa ₂Cu ₃O _6.9. Here, our results indicate that anisotropic spin fluctuations in NaFe1–xCoxAs appear in the form of a resonance in the underdoped regime, become partially gapped below T _c near optimal doping, and disappear in overdoped compounds.

Authors:

Song, Yu ^[1]; Wang, Weiyi ^[1]; Zhang, Chenglin ^[1]; Gu, Yanhong ^[2]; Lu, Xingye ^[3]; Tan, Guotai ^[3]; Su, Yixi ^[4]; Bourdarot, Frédéric ^[5];

^[6]; Li, Shiliang ^[7]; Dai, Pengcheng ^[8]

Rice Univ., Houston, TX (United States)
Chinese Academy of Sciences (CAS), Beijing (China); Univ. of Chinese Academy of Sciences, Beijing (China)
Beijing Normal Univ., Beijing (China)
Forschungszentrum Julich GmbH, Garching (Germany)
Univ. Grenoble Alpes, Grenoble (France)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Chinese Academy of Sciences (CAS), Beijing (China); Univ. of Chinese Academy of Sciences, Beijing (China); Collaborative Innovation Center of Quantum Matter, Beijing (China)
Rice Univ., Houston, TX (United States); Beijing Normal Univ., Beijing (China)

Publication Date:: 2017-11-14

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

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

OSTI Identifier:: 1409258

DOE Contract Number:: AC05-00OR22725

Resource Type:: Journal Article

Journal Name:: Physical Review B

Additional Journal Information:: Journal Volume: 96; 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

Citation Formats


                    Song, Yu, Wang, Weiyi, Zhang, Chenglin, Gu, Yanhong, Lu, Xingye, Tan, Guotai, Su, Yixi, Bourdarot, Frédéric, Christianson, Andrew D., Li, Shiliang, and Dai, Pengcheng. Temperature and polarization dependence of low-energy magnetic fluctuations in nearly optimally doped NaFe0.9785Co0.0215As.  United States: N. p., 2017. 
        Web.  doi:10.1103/PhysRevB.96.184512.

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                    Song, Yu, Wang, Weiyi, Zhang, Chenglin, Gu, Yanhong, Lu, Xingye, Tan, Guotai, Su, Yixi, Bourdarot, Frédéric, Christianson, Andrew D., Li, Shiliang, & Dai, Pengcheng. Temperature and polarization dependence of low-energy magnetic fluctuations in nearly optimally doped NaFe0.9785Co0.0215As.  United States.  https://doi.org/10.1103/PhysRevB.96.184512

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                    Song, Yu, Wang, Weiyi, Zhang, Chenglin, Gu, Yanhong, Lu, Xingye, Tan, Guotai, Su, Yixi, Bourdarot, Frédéric, Christianson, Andrew D., Li, Shiliang, and Dai, Pengcheng. Tue .  
        "Temperature and polarization dependence of low-energy magnetic fluctuations in nearly optimally doped NaFe0.9785Co0.0215As".  United States.  https://doi.org/10.1103/PhysRevB.96.184512.

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@article{osti_1409258,

  title        = {Temperature and polarization dependence of low-energy magnetic fluctuations in nearly optimally doped NaFe0.9785Co0.0215As},

  author       = {Song, Yu and Wang, Weiyi and Zhang, Chenglin and Gu, Yanhong and Lu, Xingye and Tan, Guotai and Su, Yixi and Bourdarot, Frédéric and Christianson, Andrew D. and Li, Shiliang and Dai, Pengcheng},

  abstractNote = {We use unpolarized and polarized neutron scattering to study the temperature and polarization dependence of low-energy magnetic fluctuations in nearly optimally doped NaFe0.9785Co0.0215As, with coexisting superconductivity (Tc ≈ 19 K) and weak antiferromagnetic order (TN ≈ 30 K, ordered moment ≈ 0.02μB/Fe). A single spin resonance mode with intensity tracking the superconducting order parameter is observed, although energy of the mode only softens slightly upon approaching Tc. Polarized neutron scattering reveals that the single resonance is mostly isotropic in spin space, similar to overdoped NaFe0.935Co0.045As but different from optimal electron-, hole-, and isovalently doped BaFe2As2 compounds, all featuring an additional prominent anisotropic component. Spin anisotropy in NaFe0.9785Co0.0215As is instead present at energies below the resonance, which becomes partially gapped below Tc, similar to the situation in optimally doped YBa2Cu3O6.9. Here, our results indicate that anisotropic spin fluctuations in NaFe1–xCoxAs appear in the form of a resonance in the underdoped regime, become partially gapped below Tc near optimal doping, and disappear in overdoped compounds.},

  doi          = {10.1103/PhysRevB.96.184512},

  url          = {https://www.osti.gov/biblio/1409258},
  journal      = {Physical Review B},

  issn         = {2469-9950},

  number       = 18,

  volume       = 96,

  place        = {United States},

  year         = {2017},

  month        = {11}

}

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Title: Temperature and polarization dependence of low-energy magnetic fluctuations in nearly optimally doped NaFe 0.9785 Co 0.0215 As

Abstract

Citation Formats

Distinguishing s ± and s + + electron pairing symmetries by neutron spin resonance in superconducting NaFe 0.935 Co 0.045 As journal, August 2013

Weak-coupling superconductivity in a strongly correlated iron pnictide journal, January 2016

Spin anisotropy due to spin-orbit coupling in optimally hole-doped Ba 0.67 K 0.33 Fe 2 As 2 journal, December 2016

Resonance in the electron-doped high-transition-temperature superconductor Pr0.88LaCe0.12CuO4-δ journal, July 2006

Itinerant Magnetic Excitations in Antiferromagnetic CaFe 2 As 2 journal, May 2009

Prominent Role of Spin-Orbit Coupling in FeSe Revealed by Inelastic Neutron Scattering journal, May 2017

Persistent high-energy spin excitations in iron-pnictide superconductors journal, February 2013

Measurement of a Double Neutron-Spin Resonance and an Anisotropic Energy Gap for Underdoped Superconducting NaFe 0.985 Co 0.015 As Using Inelastic Neutron Scattering journal, November 2013

Spin waves and magnetic exchange interactions in CaFe2As2 journal, July 2009

Nature of magnetic excitations in superconducting BaFe1.9Ni0.1As2 journal, March 2012

Electron doping evolution of structural and antiferromagnetic phase transitions in NaFe 1 − x Co x As iron pnictides journal, July 2016

Longitudinal Spin Excitations and Magnetic Anisotropy in Antiferromagnetically Ordered Ba Fe 2 As 2 journal, December 2013

Splitting of Resonance Excitations in Nearly Optimally Doped Ba ( Fe 0.94 Co 0.06 ) 2 As 2 : An Inelastic Neutron Scattering Study with Polarization Analysis journal, March 2013

Anisotropy of incommensurate magnetic excitations in slightly overdoped Ba 0.5 K 0.5 Fe 2 As 2 probed by polarized inelastic neutron scattering experiments journal, September 2014

Doping dependence of spin excitations and its correlations with high-temperature superconductivity in iron pnictides journal, December 2013

Transition from Three-Dimensional Anisotropic Spin Excitations to Two-Dimensional Spin Excitations by Electron Doping the FeAs-Based BaFe 1.96 Ni 0.04 As 2 Superconductor journal, August 2009

Direct observation of spin–orbit coupling in iron-based superconductors journal, December 2015

Effect of Pnictogen Height on Spin Waves in Iron Pnictides journal, May 2014

Spin Resonance in the d -Wave Superconductor CeCoIn 5 journal, February 2008

Symmetry of spin excitation spectra in the tetragonal paramagnetic and superconducting phases of 122-ferropnictides journal, October 2010

Electron doping evolution of the neutron spin resonance in NaFe 1 − x Co x As journal, May 2016

Divergent Nematic Susceptibility in an Iron Arsenide Superconductor journal, August 2012

Strong-coupling superconductivity in NaFe 1 − x Co x As: Validity of Eliashberg theory journal, April 2013

Spin anisotropy of the magnetic excitations in the normal and superconducting states of optimally doped YBa 2 Cu 3 O 6.9 studied by polarized neutron spectroscopy journal, September 2011

Crossover from spin waves to diffusive spin excitations in underdoped Ba ( Fe 1 − x Co x ) 2 As 2 journal, May 2014

Ubiquitous signatures of nematic quantum criticality in optimally doped Fe-based superconductors journal, May 2016

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

Spin Excitation Anisotropy as a Probe of Orbital Ordering in the Paramagnetic Tetragonal Phase of Superconducting BaFe 1.904 Ni 0.096 As 2 journal, September 2013

Magnonlike Dispersion of Spin Resonance in Ni-doped Ba Fe 2 As 2 journal, April 2013

Antiferromagnetic order and spin dynamics in iron-based superconductors journal, August 2015

Neutron Scattering Studies of spin excitations in hole-doped Ba0.67K0.33Fe2As2 superconductor journal, October 2011

Polarized neutron scattering studies of magnetic excitations in electron-overdoped superconducting BaFe 1.85 Ni 0.15 As 2 journal, June 2012

Unified Phase Diagram for Iron-Based Superconductors journal, October 2017

Experimental elucidation of the origin of the ‘double spin resonances’ in Ba ( Fe 1 − x Co x ) 2 As 2 journal, May 2016

Itinerant spin excitations in SrFe 2 As 2 measured by inelastic neutron scattering journal, June 2011

Spin-Orbit Interactions and the Nematicity Observed in the Fe-Based Superconductors journal, April 2015

Fermi surface nesting induced strong pairing in iron-based superconductors journal, April 2009

Magnetic anisotropy in hole-doped superconducting Ba 0.67 K 0.33 Fe 2 As 2 probed by polarized inelastic neutron scattering journal, February 2013

Environmental stability and anisotropic resistivity of Co-doped Na 1 − δ Fe 1 − x Co x As journal, October 2012

Temperature dependence of the resonance and low-energy spin excitations in superconducting FeTe 0.6 Se 0.4 journal, February 2012

In-plane spin excitation anisotropy in the paramagnetic state of NaFeAs journal, October 2013

Robust upward dispersion of the neutron spin resonance in the heavy fermion superconductor Ce1−xYbxCoIn5 journal, September 2016

Anisotropic resonance modes emerging in an antiferromagnetic superconducting state journal, September 2017

Spin excitation anisotropy in the paramagnetic tetragonal phase of BaFe 2 As 2 journal, July 2017

Structural and magnetic phase transitions in Na 1 − δ FeAs journal, July 2009

Electron doping evolution of the magnetic excitations in NaFe 1 − x Co x As journal, June 2016

Local magnetic anisotropy in BaFe 2 As 2 : A polarized inelastic neutron scattering study journal, August 2012

Suppression of spin-exciton state in hole overdoped iron-based superconductors journal, March 2016

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

Anisotropic neutron spin resonance in underdoped superconducting NaFe 1 − x Co x As journal, October 2014

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

Nematic spin fluid in the tetragonal phase of BaFe 2 As 2 journal, August 2011

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

Polarized and unpolarized neutron-scattering study of the dynamical spin susceptibility of Y Ba 2 Cu 3 O 7 journal, September 1996

Spin fluctuations in iron pnictides and chalcogenides: From antiferromagnetism to superconductivity journal, January 2016

Nematic Quantum Critical Fluctuations in BaFe 2 − x Ni x As 2 journal, October 2016

Electron-doping evolution of the low-energy spin excitations in the iron arsenide superconductor BaFe 2 − x Ni x As 2 journal, May 2010

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

Title: Temperature and polarization dependence of low-energy magnetic fluctuations in nearly optimally doped ${NaFe}_{0.9785} {Co}_{0.0215} As$

Distinguishing $s^{\pm}$ and $s^{+ +}$ electron pairing symmetries by neutron spin resonance in superconducting NaFe $_{0.935}$ Co $_{0.045}$ As
journal, August 2013

Weak-coupling superconductivity in a strongly correlated iron pnictide
journal, January 2016

Spin anisotropy due to spin-orbit coupling in optimally hole-doped ${Ba}_{0.67} K_{0.33} {Fe}_{2} {As}_{2}$
journal, December 2016

Resonance in the electron-doped high-transition-temperature superconductor Pr0.88LaCe0.12CuO4-δ
journal, July 2006

Itinerant Magnetic Excitations in Antiferromagnetic ${CaFe}_{2} {As}_{2}$
journal, May 2009

Prominent Role of Spin-Orbit Coupling in FeSe Revealed by Inelastic Neutron Scattering
journal, May 2017

Persistent high-energy spin excitations in iron-pnictide superconductors
journal, February 2013

Measurement of a Double Neutron-Spin Resonance and an Anisotropic Energy Gap for Underdoped Superconducting ${NaFe}_{0.985} {Co}_{0.015} As$ Using Inelastic Neutron Scattering
journal, November 2013

Spin waves and magnetic exchange interactions in CaFe2As2
journal, July 2009

Nature of magnetic excitations in superconducting BaFe1.9Ni0.1As2
journal, March 2012

Electron doping evolution of structural and antiferromagnetic phase transitions in ${NaFe}_{1 - x} {Co}_{x} As$ iron pnictides
journal, July 2016

Longitudinal Spin Excitations and Magnetic Anisotropy in Antiferromagnetically Ordered $Ba {Fe}_{2} {As}_{2}$
journal, December 2013

Splitting of Resonance Excitations in Nearly Optimally Doped $Ba ({Fe}_{0.94} {Co}_{0.06})_{2} {As}_{2}$ : An Inelastic Neutron Scattering Study with Polarization Analysis
journal, March 2013

Anisotropy of incommensurate magnetic excitations in slightly overdoped ${Ba}_{0.5} K_{0.5} {Fe}_{2} {As}_{2}$ probed by polarized inelastic neutron scattering experiments
journal, September 2014

Doping dependence of spin excitations and its correlations with high-temperature superconductivity in iron pnictides
journal, December 2013

Transition from Three-Dimensional Anisotropic Spin Excitations to Two-Dimensional Spin Excitations by Electron Doping the FeAs-Based ${BaFe}_{1.96} {Ni}_{0.04} {As}_{2}$ Superconductor
journal, August 2009

Direct observation of spin–orbit coupling in iron-based superconductors
journal, December 2015

Effect of Pnictogen Height on Spin Waves in Iron Pnictides
journal, May 2014

Spin Resonance in the $d$ -Wave Superconductor ${CeCoIn}_{5}$
journal, February 2008

Symmetry of spin excitation spectra in the tetragonal paramagnetic and superconducting phases of 122-ferropnictides
journal, October 2010

Electron doping evolution of the neutron spin resonance in ${NaFe}_{1 - x} {Co}_{x} As$
journal, May 2016

Divergent Nematic Susceptibility in an Iron Arsenide Superconductor
journal, August 2012

Strong-coupling superconductivity in NaFe $_{1 - x}$ Co $_{x}$ As: Validity of Eliashberg theory
journal, April 2013

Spin anisotropy of the magnetic excitations in the normal and superconducting states of optimally doped YBa $_{2}$ Cu $_{3}$ O $_{6.9}$ studied by polarized neutron spectroscopy
journal, September 2011

Crossover from spin waves to diffusive spin excitations in underdoped $Ba ({Fe}_{1 - x} {Co}_{x})_{2} {As}_{2}$
journal, May 2014

Ubiquitous signatures of nematic quantum criticality in optimally doped Fe-based superconductors
journal, May 2016

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

Spin Excitation Anisotropy as a Probe of Orbital Ordering in the Paramagnetic Tetragonal Phase of Superconducting ${BaFe}_{1.904} {Ni}_{0.096} {As}_{2}$
journal, September 2013

Magnonlike Dispersion of Spin Resonance in Ni-doped $Ba {Fe}_{2} {As}_{2}$
journal, April 2013

Antiferromagnetic order and spin dynamics in iron-based superconductors
journal, August 2015

Neutron Scattering Studies of spin excitations in hole-doped Ba0.67K0.33Fe2As2 superconductor
journal, October 2011

Polarized neutron scattering studies of magnetic excitations in electron-overdoped superconducting BaFe $_{1.85}$ Ni $_{0.15}$ As $_{2}$
journal, June 2012

Unified Phase Diagram for Iron-Based Superconductors
journal, October 2017

Experimental elucidation of the origin of the ‘double spin resonances’ in $Ba {({Fe}_{1 - x} {Co}_{x})}_{2} {As}_{2}$
journal, May 2016

Itinerant spin excitations in SrFe $_{2}$ As $_{2}$ measured by inelastic neutron scattering
journal, June 2011

Spin-Orbit Interactions and the Nematicity Observed in the Fe-Based Superconductors
journal, April 2015

Fermi surface nesting induced strong pairing in iron-based superconductors
journal, April 2009

Magnetic anisotropy in hole-doped superconducting Ba $_{0.67}$ K $_{0.33}$ Fe $_{2}$ As $_{2}$ probed by polarized inelastic neutron scattering
journal, February 2013

Environmental stability and anisotropic resistivity of Co-doped Na $_{1 - δ}$ Fe $_{1 - x}$ Co $_{x}$ As
journal, October 2012

Temperature dependence of the resonance and low-energy spin excitations in superconducting FeTe $_{0.6}$ Se $_{0.4}$
journal, February 2012

In-plane spin excitation anisotropy in the paramagnetic state of NaFeAs
journal, October 2013

Robust upward dispersion of the neutron spin resonance in the heavy fermion superconductor Ce1−xYbxCoIn5
journal, September 2016

Anisotropic resonance modes emerging in an antiferromagnetic superconducting state
journal, September 2017

Spin excitation anisotropy in the paramagnetic tetragonal phase of ${BaFe}_{2} {As}_{2}$
journal, July 2017

Structural and magnetic phase transitions in ${Na}_{1 - δ} FeAs$
journal, July 2009

Electron doping evolution of the magnetic excitations in ${NaFe}_{1 - x} {Co}_{x} As$
journal, June 2016

Local magnetic anisotropy in BaFe $_{2}$ As $_{2}$ : A polarized inelastic neutron scattering study
journal, August 2012

Suppression of spin-exciton state in hole overdoped iron-based superconductors
journal, March 2016

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

Anisotropic neutron spin resonance in underdoped superconducting ${NaFe}_{1 - x} {Co}_{x} As$
journal, October 2014

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

Nematic spin fluid in the tetragonal phase of BaFe $_{2}$ As $_{2}$
journal, August 2011

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

Polarized and unpolarized neutron-scattering study of the dynamical spin susceptibility of Y ${Ba}_{2}$ ${Cu}_{3}$ $O_{7}$
journal, September 1996

Spin fluctuations in iron pnictides and chalcogenides: From antiferromagnetism to superconductivity
journal, January 2016

Nematic Quantum Critical Fluctuations in ${BaFe}_{2 - x} {Ni}_{x} {As}_{2}$
journal, October 2016

Electron-doping evolution of the low-energy spin excitations in the iron arsenide superconductor ${BaFe}_{2 - x} {Ni}_{x} {As}_{2}$
journal, May 2010

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