Publication Date
9-26-2018
Department
Ames Laboratory; Chemistry; Physics and Astronomy
Campus Units
Chemistry, Physics and Astronomy, Ames Laboratory
OSTI ID+
1477242
Report Number
IS-J 9747
DOI
10.1103/PhysRevLett.121.137204
Journal Title
Physical Review Letters
Volume Number
121
Issue Number
13
First Page
137204
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(Fe1−xNix)4As4exhibits an antiferromagnetic (AFM) state, called hedgehog spin-vortex crystal (SVC) 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.
DOE Contract Number(s)
AC02-07CH11358; GBMF4411
Language
en
Department of Energy Subject Categories
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
Publisher
Iowa State University Digital Repository, Ames IA (United States)
