Dependence of the absolute value of the penetration depth in $\mathrm{\mathbf{{(Ba_{1-x}K_x)Fe_2As_2}}}$ on doping

Avior Almoalem; Alon Yagil; Kyuil Cho; Serafim Teknowijoyo; Makariy A. Tanatar; Ruslan Prozorov; Yong Liu; Thomas A. Lograsso; Ophir M. Auslaender

doi:10.1103/PhysRevB.98.054516

Dependence of the absolute value of the penetration depth in $\mathrm{\mathbf{{(Ba_{1-x}K_x)Fe_2As_2}}}$ on doping

Superconductivity 2018-10-16 v3 Materials Science Strongly Correlated Electrons

Authors: Avior Almoalem , Alon Yagil , Kyuil Cho , Serafim Teknowijoyo , Makariy A. Tanatar , Ruslan Prozorov , Yong Liu , Thomas A. Lograsso , Ophir M. Auslaender

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Abstract

We report magnetic force microscopy (MFM) measurements on the iron-based superconductor $\mathrm{Ba_{1-x}K_xFe_2As_2}$ . By measuring locally the Meissner repulsion with the magnetic MFM tip, we determine the absolute value of the in-plane magnetic penetration depth ( $\lambda_{ab}$ ) in underdoped, optimally-doped, and overdoped samples. The results suggest an abrupt increase of $\lambda_{ab}$ as doping is increased from $x_\mathrm{opt}$ , which is potentially related to the presence of a quantum critical point. The response of superconducting vortices to magnetic forces exerted by the MFM tip for $x=0.19$ and $0.58$ is compatible with previously observed structural symmetries at those doping levels.

Keywords

iron-based superconductor magnetic penetration depth magnetic force microscopy Meissner effect doping dependence quantum critical point

Cite

@article{arxiv.1708.00683,
  title  = {Dependence of the absolute value of the penetration depth in $\mathrm{\mathbf{{(Ba_{1-x}K_x)Fe_2As_2}}}$ on doping},
  author = {Avior Almoalem and Alon Yagil and Kyuil Cho and Serafim Teknowijoyo and Makariy A. Tanatar and Ruslan Prozorov and Yong Liu and Thomas A. Lograsso and Ophir M. Auslaender},
  journal= {arXiv preprint arXiv:1708.00683},
  year   = {2018}
}

Comments

Replaced Fig. 5 and 6, minor changes to the rest of the text

Dependence of the absolute value of the penetration depth in $\mathrm{\mathbf{{(Ba_{1-x}K_x)Fe_2As_2}}}$ on doping

Abstract

Keywords

Cite

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