Study of the Rare Earth Effects on the Magnetic Fluctuations in RbLn2Fe4As4O2 (Ln \(=\) Tb, Dy, and Ho) by Mössbauer Spectroscopy

  • Zhiwei Li
  • Yang Li
  • Zhicheng Wang
  • Guanghan Cao
  • Bo Zhang
  • Hua Pang
  • Fashen Li
Original Paper

Abstract

In the current work, we report the investigation of RbLn2Fe4As4O2 (Ln \(=\) Tb, Dy, and Ho) and RbFe2As2 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.

Keywords

Mössbauer spectroscopy Superconductivity Magnetic fluctuations 

Notes

Funding information

This work was supported by the National Natural Science Foundations of China (No. 11704167), the Fundamental Research Funds for the Central Universities (No. lzujbky-2017-31), and the National Key Research and Development Program of China (No. 2016YFA0300202).

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Institute of Applied Magnetics, Key Lab for Magnetism and Magnetic Materials of the Ministry of EducationLanzhou UniversityLanzhouPeople’s Republic of China
  2. 2.Department of PhysicsZhejiang UniversityHangzhouPeople’s Republic of China

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