Superconductivity and magnetism in CaK(Fe1-xMnx)4As4 system
ORAL
Abstract
Substitution of Fe with Ni or Co in CaKFe4As4 suppresses superconductivity and stabilizes an unusual hedgehog spin-vortex crystal magnetic structure [1-4]. Similarly, as Mn is substituted in CaKFe4As4, superconductivity is suppressed and magnetic order appears. Given that it was not possible to induce superconductivity in Ba(Fe1-xMnx)2As2, we can now study the CaK(Fe1-xMnx)4As4 system so as to gain insight into how the often more local moment like Mn affects superconductivity in these Fe-based superconducting systems. The T-x phase diagram of CaK(Fe1-xMnx)4As4 determined by resistance, magnetization and heat capacity will be presented and compared with the Ni or Co substituted systems. The superconducting critical field data as well as BNC scaling [5] will be also discussed. In addition Pressure-temperature phase diagram determined by resistance under hydrostatic pressure up to 5.15 GPa will also be presented and discussed.
*This work is supported by the US DOE, Ames laboratory under contract No.DE-AC02-07CH11358. W.R.M. was supported by Moore Foundation's EPiQS, Grant No. GBMF4411.
–
Publication: [1], W. R. Meier, et al., npj Quant. Mat. 3, 5 (2018).
[2], S. L. Bud'ko, et al., Phys. Rev. B 98, 144520 (2018).
[3], A. Kreyssig, et al., PRB 97, 224521 (2018).
[4], Q.-P. Ding, et al., PRL. 121, 137204 (2018).
[5], S. L. Bud'ko et al., PRB 79, 220516 (2009).
Presenters
-
Mingyu Xu
- Iowa State University