Multigap nodeless superconductivity in CsCa2Fe4As4F2 probed by heat transport

Y. Y. Huang; Z. C. Wang; Y. J. Yu; J. M. Ni; Q. Li; E. J. Cheng; G. H. Cao; S. Y. Li

doi:10.1103/PhysRevB.99.020502

Multigap nodeless superconductivity in CsCa2Fe4As4F2 probed by heat transport

Superconductivity 2019-01-16 v1 Materials Science Strongly Correlated Electrons

Authors: Y. Y. Huang , Z. C. Wang , Y. J. Yu , J. M. Ni , Q. Li , E. J. Cheng , G. H. Cao , S. Y. Li

View on arXiv ↗ PDF ↗ DOI ↗

Abstract

Recently, a new family of iron-based superconductors called 12442 was discovered and the muon spin relaxation ( $\mu$ SR) measurements on KCa $_2$ Fe $_4$ As $_4$ F $_2$ and CsCa $_2$ Fe $_4$ As $_4$ F $_2$ polycrystals, two members of the family, indicated that both have a nodal superconducting gap structure with $s+d$ pairing symmetry. Here we report the ultralow-temperature thermal conductivity measurements on CsCa $_2$ Fe $_4$ As $_4$ F $_2$ single crystals ( $T_c$ = 29.3 K). A negligible residual linear term $\kappa_0/T$ in zero field and the field dependence of $\kappa_0/T$ suggest multiple nodeless superconducting gaps in CsCa $_2$ Fe $_4$ As $_4$ F $_2$ . This gap structure is similar to CaKFe $_4$ As $_4$ and moderately doped Ba $_{1-x}$ K $_x$ Fe $_2$ As $_2$ , but contrasts to the nodal gap structure indicated by the $\mu$ SR measurements on CsCa $_2$ Fe $_4$ As $_4$ F $_2$ polycrystals.

Keywords

iron-based superconductor nodeless gap multigap superconductivity thermal conductivity muon spin relaxation

Cite

@article{arxiv.1811.06379,
  title  = {Multigap nodeless superconductivity in CsCa2Fe4As4F2 probed by heat transport},
  author = {Y. Y. Huang and Z. C. Wang and Y. J. Yu and J. M. Ni and Q. Li and E. J. Cheng and G. H. Cao and S. Y. Li},
  journal= {arXiv preprint arXiv:1811.06379},
  year   = {2019}
}

Comments

6 pages, 4 figures

Multigap nodeless superconductivity in CsCa2Fe4As4F2 probed by heat transport

Abstract

Keywords

Cite

Comments

Related papers