Hedgehog Spin-Vortex Crystal Antiferromagnetic Quantum Criticality in CaK(Fe1-xNix)4As4 Revealed by NMR

doi:10.1103/PhysRevLett.121.137204

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Title: Hedgehog Spin-Vortex Crystal Antiferromagnetic Quantum Criticality in $CaK ({Fe}_{1 - x} {Ni}_{x})_{4} {As}_{4}$ Revealed by NMR

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Abstract

Two ordering states, antiferromagnetism and nematicity, have been observed in most iron-based superconductors (SCs). In contrast to those SCs, the newly discovered SC CaK(Fe _1-xNi _x) ₄As ₄ exhibits an antiferromagnetic (AFM) state, called hedgehog spin-vortex crystal structure, without nematic order, providing the opportunity for the investigation into the relationship between spin fluctuations and SC without any effects of nematic fluctuations. Our ⁷⁵As nuclear magnetic resonance studies on CaK(Fe _1-xNi _x) ₄As ₄ (0≤ x ≤ 0.049) revealed that CaKFe ₄As ₄ is located close to a hidden hedgehog SVC AFM quantum-critical point (QCP). The magnetic QCP without nematicity in CaK(Fe _1-xNi _x) ₄As ₄ highlights the close connection of spin fluctuations and superconductivity in iron-based SCs. The advantage of stoichiometric composition also makes CaKFe ₄As ₄ an ideal platform for further detailed investigation of the relationship between magnetic QCP and superconductivity in iron-based SCs without disorder effects.

Authors:

Ding, Q. -P. ^[1]; Meier, W. R. ^[1]; Cui, J. ^[1]; Xu, M. ^[1]; Böhmer, A. E. ^[1]; Bud’ko, S. L. ^[1]; Canfield, P. C. ^[1]; Furukawa, Y. ^[1]

Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States)

Publication Date:: 2018-09-26

Research Org.:: Ames Lab., Ames, IA (United States)

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

OSTI Identifier:: 1477242

Alternate Identifier(s):: OSTI ID: 1473998

Report Number(s):: IS-J-9747
Journal ID: ISSN 0031-9007; PRLTAO

Grant/Contract Number:: AC02-07CH11358; GBMF4411

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review Letters

Additional Journal Information:: Journal Volume: 121; Journal Issue: 13; Journal ID: ISSN 0031-9007

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

Subject:: 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS

Citation Formats


                    Ding, Q. -P., Meier, W. R., Cui, J., Xu, M., Böhmer, A. E., Bud’ko, S. L., Canfield, P. C., and Furukawa, Y. Hedgehog Spin-Vortex Crystal Antiferromagnetic Quantum Criticality in CaK(Fe1-xNix)4As4 Revealed by NMR.  United States: N. p., 2018. 
        Web.  doi:10.1103/PhysRevLett.121.137204.

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                    Ding, Q. -P., Meier, W. R., Cui, J., Xu, M., Böhmer, A. E., Bud’ko, S. L., Canfield, P. C., & Furukawa, Y. Hedgehog Spin-Vortex Crystal Antiferromagnetic Quantum Criticality in CaK(Fe1-xNix)4As4 Revealed by NMR.  United States.  doi:10.1103/PhysRevLett.121.137204.

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                    Ding, Q. -P., Meier, W. R., Cui, J., Xu, M., Böhmer, A. E., Bud’ko, S. L., Canfield, P. C., and Furukawa, Y. Wed .  
        "Hedgehog Spin-Vortex Crystal Antiferromagnetic Quantum Criticality in CaK(Fe1-xNix)4As4 Revealed by NMR".  United States.  doi:10.1103/PhysRevLett.121.137204.

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@article{osti_1477242,

  title        = {Hedgehog Spin-Vortex Crystal Antiferromagnetic Quantum Criticality in CaK(Fe1-xNix)4As4 Revealed by NMR},

  author       = {Ding, Q. -P. and Meier, W. R. and Cui, J. and Xu, M. and Böhmer, A. E. and Bud’ko, S. L. and Canfield, P. C. and Furukawa, Y.},

  abstractNote = {Two ordering states, antiferromagnetism and nematicity, have been observed in most iron-based superconductors (SCs). In contrast to those SCs, the newly discovered SC CaK(Fe1-xNix)4As4 exhibits an antiferromagnetic (AFM) state, called hedgehog spin-vortex crystal structure, without nematic order, providing the opportunity for the investigation into the relationship between spin fluctuations and SC without any effects of nematic fluctuations. Our 75As nuclear magnetic resonance studies on CaK(Fe1-xNix)4As4 (0≤ x ≤ 0.049) revealed that CaKFe4As4 is located close to a hidden hedgehog SVC AFM quantum-critical point (QCP). The magnetic QCP without nematicity in CaK(Fe1-xNix)4As4 highlights the close connection of spin fluctuations and superconductivity in iron-based SCs. The advantage of stoichiometric composition also makes CaKFe4As4 an ideal platform for further detailed investigation of the relationship between magnetic QCP and superconductivity in iron-based SCs without disorder effects.},

  doi          = {10.1103/PhysRevLett.121.137204},

  journal      = {Physical Review Letters},

  number       = 13,

  volume       = 121,

  place        = {United States},

  year         = {2018},

  month        = {9}

}

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This content will become publicly available on September 26, 2019

Title: Hedgehog Spin-Vortex Crystal Antiferromagnetic Quantum Criticality in CaK ( Fe 1 - x Ni x ) 4 As 4 Revealed by NMR

Abstract

Citation Formats

Title: Hedgehog Spin-Vortex Crystal Antiferromagnetic Quantum Criticality in $CaK ({Fe}_{1 - x} {Ni}_{x})_{4} {As}_{4}$ Revealed by NMR