Study of the rare earth effects on the magnetic fluctuations in RbLn${}_2$Fe${}_4$As${}_4$O${}_2$ (Ln = Tb, Dy and Ho) by Mössbauer spectroscopy

Abstract

In the current work, we report the investigation of RbLn${}_2$Fe${}_4$As${}_4$O${}_2$ (Ln = Tb, Dy and Ho) and RbFe${}_2$As${}_2$ by ${}^{57}$Fe Mössbauer spectroscopy. Singlet pattern has been observed for all the samples indicating the absence of static magnetic ordering down to 5.9\,K on the Fe sublattice. The observed intermediate value of the isomer shift confirms the effective self charge transfer effect for the studied superconductors. Debye temperatures of these samples have been determined by the temperature dependence of the isomer shift. Most importantly, we observe different spectral line width broadening behaviors for samples with different rare earth elements, and no line width broadenings for samples Ln=Tb and Ho. These results suggest that the observed magnetic fluctuations at the Fe site might be sensitive to the magnetic behaviors of the rare earth magnetic moments.

arXiv comment5 pages, 4 figures, J Supercond Nov Magn (2018)

References in corpus (17)

• Superconductivity at 38 K in the iron arsenide (Ba1-xKx)Fe2As2
• The Puzzle of High Temperature Superconductivity in Layered Iron Pnictides and Chalcogenides
• LiFeAs: An Intrinsic FeAs-based Superconductor with Tc = 18K
• Structure, antiferromagnetism and superconductivity of the layered iron arsenide NaFeAs
• Superconductivity in KCa${}_2$Fe${}_4$As${}_4$F${}_2$ with Separate Double Fe${}_2$As${}_2$ Layers
• Influence of the rare-earth element on the effects of the structural and magnetic phase transitions in CeFeAsO, PrFeAsO, and NdFeAsO
• Self doping effect and successive magnetic transitions in superconducting Sr${}_2$VFeAsO${}_3$
• Synthesis, crystal structure and superconductivity in Rb$L{n}_2$Fe${}_4$As${}_4$O${}_2$ ($Ln$ = Sm, Tb, Dy and Ho)
• Interplay between magnetism and superconductivity in EuFe(2-x)Co(x)As2 studied by 57Fe and 151Eu Mössbauer spectroscopy
• Calorimetric study in single crystal of CsFe${}_2$As${}_2$
• Transition to collapsed tetragonal phase in CaFe2As2 single crystals as seen by 57Fe Mossbauer spectroscopy
• Charge redistribution at the antiferromagnetic phase transition in SrFeAsF compound
• ${}^{57}$Fe Mössbauer study of stoichiometric iron based superconductor CaKFe${}_4$As${}_4$: a comparison to KFe${}_2$As${}_2$ and CaFe${}_2$As${}_2$
• Intercalation effect on hyperfine parameters of Fe in FeSe superconductor with Tc = 42 K
• Incommensurate Spin Density Wave versus local magnetic inhomogeneities in Ba(Fe1-xNix)2As2: a 57Fe Mossbauer spectroscopy study
• Mössbauer spectroscopy study of magnetic fluctuations in superconducting RbGd${}_2$Fe${}_4$As${}_4$O${}_2$
• Paramagnetic Phase of a Heavy-Fermion Compound, CeFePO, Probed by 57Fe Mössbauer Spectroscopy