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Title: NMR Study of the New Magnetic Superconductor CaK(Fe 0:951Ni0:049) 4As 4: Microscopic Coexistence of Hedgehog Spin-vortex Crystal and Superconductivity

Coexistence of a new-type antiferromagnetic (AFM) state, the so-called hedgehog spin-vortex crystal (SVC), and superconductivity (SC) is evidenced by 75As nuclear magnetic resonance study on single-crystalline CaK(Fe 0:951Ni0:049) 4As 4. The hedgehog SVC order is clearly demonstrated by the direct observation of the internal magnetic induction along the c axis at the As1 site (close to K) and a zero net internal magnetic induction at the As2 site (close to Ca) below an AFM ordering temperature T N ~ 52 K. The nuclear spin-lattice relaxation rate 1/T 1 shows a distinct decrease below T c ~ 10 K, providing also unambiguous evidence for the microscopic coexistence. Furthermore, based on the analysis of the 1/T 1 data, the hedgehog SVC-type spin correlations are found to be enhanced below T ~ 150 K in the paramagnetic state. Furthermore, these results indicate the hedgehog SVC-type spin correlations play an important role for the appearance of SC in the new magnetic superconductor.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1]
  1. Ames Lab. and Iowa State Univ., Ames, IA (United States)
Publication Date:
Report Number(s):
IS-J-9543
Journal ID: ISSN 2469-9950
Grant/Contract Number:
AC02-07CH11358
Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 96; Journal Issue: 22; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Research Org:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
OSTI Identifier:
1415856
Alternate Identifier(s):
OSTI ID: 1416432

Ding, Q. P., Meier, W. R., Bohmer, A. E., Bud'ko, S. L., Canfield, Paul C., and Furukawa, Yuji. NMR Study of the New Magnetic Superconductor CaK(Fe0:951Ni0:049)4As4: Microscopic Coexistence of Hedgehog Spin-vortex Crystal and Superconductivity. United States: N. p., Web. doi:10.1103/PhysRevB.96.220510.
Ding, Q. P., Meier, W. R., Bohmer, A. E., Bud'ko, S. L., Canfield, Paul C., & Furukawa, Yuji. NMR Study of the New Magnetic Superconductor CaK(Fe0:951Ni0:049)4As4: Microscopic Coexistence of Hedgehog Spin-vortex Crystal and Superconductivity. United States. doi:10.1103/PhysRevB.96.220510.
Ding, Q. P., Meier, W. R., Bohmer, A. E., Bud'ko, S. L., Canfield, Paul C., and Furukawa, Yuji. 2017. "NMR Study of the New Magnetic Superconductor CaK(Fe0:951Ni0:049)4As4: Microscopic Coexistence of Hedgehog Spin-vortex Crystal and Superconductivity". United States. doi:10.1103/PhysRevB.96.220510.
@article{osti_1415856,
title = {NMR Study of the New Magnetic Superconductor CaK(Fe0:951Ni0:049)4As4: Microscopic Coexistence of Hedgehog Spin-vortex Crystal and Superconductivity},
author = {Ding, Q. P. and Meier, W. R. and Bohmer, A. E. and Bud'ko, S. L. and Canfield, Paul C. and Furukawa, Yuji},
abstractNote = {Coexistence of a new-type antiferromagnetic (AFM) state, the so-called hedgehog spin-vortex crystal (SVC), and superconductivity (SC) is evidenced by 75As nuclear magnetic resonance study on single-crystalline CaK(Fe0:951Ni0:049)4As4. The hedgehog SVC order is clearly demonstrated by the direct observation of the internal magnetic induction along the c axis at the As1 site (close to K) and a zero net internal magnetic induction at the As2 site (close to Ca) below an AFM ordering temperature TN ~ 52 K. The nuclear spin-lattice relaxation rate 1/T1 shows a distinct decrease below Tc ~ 10 K, providing also unambiguous evidence for the microscopic coexistence. Furthermore, based on the analysis of the 1/T1 data, the hedgehog SVC-type spin correlations are found to be enhanced below T ~ 150 K in the paramagnetic state. Furthermore, these results indicate the hedgehog SVC-type spin correlations play an important role for the appearance of SC in the new magnetic superconductor.},
doi = {10.1103/PhysRevB.96.220510},
journal = {Physical Review B},
number = 22,
volume = 96,
place = {United States},
year = {2017},
month = {12}
}