Antiferromagnetic order in Ca$_{10}$(Pt$_3$As$_8$)(Fe$_2$As$_2$)$_5$ observed by $^{75}$As NMR

T. Zhou; G. Koutroulakis; J. Lodico; Ni Ni; J. D. Thompson; R. J. Cava; S. E. Brown

doi:10.1088/0953-8984/25/12/122201

Antiferromagnetic order in Ca$_{10}$(Pt$_3$As$_8$)(Fe$_2$As$_2$)$_5$ observed by $^{75}$As NMR

Strongly Correlated Electrons 2013-02-22 v2 Superconductivity

Authors: T. Zhou , G. Koutroulakis , J. Lodico , Ni Ni , J. D. Thompson , R. J. Cava , S. E. Brown

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Abstract

$^{75}$ As nuclear magnetic resonance (NMR) measurements carried out on underdoped, non-superconducting Ca $_{10}$ (Pt $_3$ As $_8$ )(Fe $_2$ As $_2$ ) $_5$ reveal physical properties that are similar but not identical to the 122 superconductor parent compounds such as BaFe $_2$ As $_2$ . Results from the single crystal study indicate a phase transition to an antiferromagnetic (AF) state on cooling through T~100K, albeit nonuniformly. Specifically, the NMR lineshape reflects the presence of staggered hyperfine fields on the As sites associated with a striped AF order. The variation of the internal hyperfine field with temperature suggests that the phase transition to the AF state is discontinuous, and therefore likely coincident with the structural transition inferred from transport experiments.

Keywords

antiferromagnetic order iron-based superconductors nuclear magnetic resonance Ca10(Pt3As8)(Fe2As2)5 hyperfine field phase transition striped AF order

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@article{arxiv.1212.3901,
  title  = {Antiferromagnetic order in Ca$_{10}$(Pt$_3$As$_8$)(Fe$_2$As$_2$)$_5$ observed by $^{75}$As NMR},
  author = {T. Zhou and G. Koutroulakis and J. Lodico and Ni Ni and J. D. Thompson and R. J. Cava and S. E. Brown},
  journal= {arXiv preprint arXiv:1212.3901},
  year   = {2013}
}

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5 pages, 3 figures

Antiferromagnetic order in Ca$_{10}$(Pt$_3$As$_8$)(Fe$_2$As$_2$)$_5$ observed by $^{75}$As NMR

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