NMR studies of magnetism and superconducting properties of CaK(Fe<sub>1-x</sub>Ni<sub>x</sub>)<sub>4</sub>As<sub>4</sub>
· Invited
Abstract
We have carried out nuclear magnetic resonance measurements on the recent discovered new iron-based superconductor CaKFe4As4 (Tc = 35 K). Based on NMR data, we will discuss the details of superconducting properties and magnetic fluctuations of CaKFe4As4 [1], which will be compared with those in other Fe-based SC such as 122 systems. In addition, we will report the first observation of the hedgehog spin vortex crystal order in the antiferromagnetic state in Ni-doped CaK(Fe1-xNix)4As4 (Tn = 52 K and Tc= 9 K for x=0.05) [2,3]. Furthermore, the Ni doping x dependence of magnetic fluctuations will be presented and we will discuss a possible quantum critical behavior in in Ni-doped CaK(Fe1-xNix)4As4.
This work was done in collaboration with Q.-P. Ding, J. Cui, P. Wiecki, K. Rana, W. R. Meier, S. L. Bud’ko, A. E. Böhmer, P. C. Canfield, Y. Lee, V. Borisov, R. Valentí, P. Orth, and R. Fernandes.
[1] J. Cui, et al., Phys. Rev. B 96, 104512 (2017).
[2] W. R. Meier , et al., arXive:1706.01067.
[3] Q.-P. Ding et al., submitted to PRL
This work was done in collaboration with Q.-P. Ding, J. Cui, P. Wiecki, K. Rana, W. R. Meier, S. L. Bud’ko, A. E. Böhmer, P. C. Canfield, Y. Lee, V. Borisov, R. Valentí, P. Orth, and R. Fernandes.
[1] J. Cui, et al., Phys. Rev. B 96, 104512 (2017).
[2] W. R. Meier , et al., arXive:1706.01067.
[3] Q.-P. Ding et al., submitted to PRL
*The research was supported by the U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering. Ames Laboratory is operated for the U.S. Department of Energy by Iowa State University under Contract No.~DE-AC02-07CH11358.
–
Presenters
-
Yuji Furukawa
- Dept. of Physics, Iowa State Univ
- Department of Physics and Astronomy, Iowa State University