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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

Abstract

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:
Research Org.:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1415856
Alternate Identifier(s):
OSTI ID: 1416432
Report Number(s):
IS-J-9543
Journal ID: ISSN 2469-9950
Grant/Contract Number:  
AC02-07CH11358
Resource Type:
Journal Article: 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)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

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., 2017. 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. Fri . "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. https://www.osti.gov/servlets/purl/1415856.
@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},
issn = {2469-9950},
number = 22,
volume = 96,
place = {United States},
year = {2017},
month = {12}
}

Journal Article:
Free Publicly Available Full Text
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Cited by: 7 works
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Figures / Tables:

Figure-1 Figure-1: Phase diagram of CaK(Fe1−xNix)4As4. TN and Tc determined from resistivity and magnetization are from Ref. 25. The inset shows the crystal structure of CaKFe4As4 where the two crystallographically inequivalent As sites exist: As1 and As2 sites close to the K and Ca layers, respectively.

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    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.