Scaling between magnetic and lattice fluctuations in iron-pnictide superconductors

R. M. Fernandes; A. E. Böhmer; C. Meingast; J. Schmalian

doi:10.1103/PhysRevLett.111.137001

Scaling between magnetic and lattice fluctuations in iron-pnictide superconductors

Superconductivity 2013-09-27 v2 Strongly Correlated Electrons

Authors: R. M. Fernandes , A. E. Böhmer , C. Meingast , J. Schmalian

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Abstract

The phase diagram of the iron arsenides is dominated by a magnetic and a structural phase transition, which need to be suppressed in order for superconductivity to appear. The proximity between the two transition temperature lines indicates correlation between these two phases, whose nature remains unsettled. Here, we find a scaling relation between nuclear magnetic resonance (NMR) and shear modulus data in the tetragonal phase of electron-doped $\mathrm{Ba(Fe_{1-x}Co_{x})_{2}As_{2}}$ compounds. Because the former probes the strength of magnetic fluctuations while the latter is sensitive to orthorhombic fluctuations, our results provide strong evidence for a magnetically-driven structural transition.

Keywords

iron-pnictide superconductors magnetic fluctuations lattice fluctuations structural phase transition nuclear magnetic resonance shear modulus scaling relation

Cite

@article{arxiv.1306.0521,
  title  = {Scaling between magnetic and lattice fluctuations in iron-pnictide superconductors},
  author = {R. M. Fernandes and A. E. Böhmer and C. Meingast and J. Schmalian},
  journal= {arXiv preprint arXiv:1306.0521},
  year   = {2013}
}

Comments

revised version; 4 pages + references; 3 figs

Scaling between magnetic and lattice fluctuations in iron-pnictide superconductors

Abstract

Keywords

Cite

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