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

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

doi:10.1103/PhysRevLett.121.137204

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

Journal Article · 25 September 2018 · Physical Review Letters

DOI: https://doi.org/10.1103/PhysRevLett.121.137204 · OSTI ID:1477242

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)

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)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(Fe_1-xNi_x)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(Fe_1-xNi_x)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.

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

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

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 1477242

Alternate ID(s):: OSTI ID: 1473998

Report Number(s):: IS-J--9747

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 13 Vol. 121; ISSN 0031-9007; ISSN PRLTAO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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