The gradual destruction of magnetism in the superconducting family NaFe(1-x)CoxAs

Details The gradual destruction of magnetism in the superconducting family NaFe(1-x)CoxAs The gradual destruction of magnetism in the superconducting family NaFe(1-x)CoxAs

2011-12-02

arxiv.org/abs/1112.0419v1

Physics

Condensed Matter

Superconductivity

7 pages, 7 figures

Scientific paper

The interplay and coexistence of superconducting, magnetic and structural order parameters in NaFe{1-x}Co{x}As has been studied using SQUID magnetometry, muon-spin rotation and synchrotron x-ray powder diffraction. Substituting Fe by Co weakens the ordered magnetic state through both a suppression of T_N and a reduction in the size of the ordered moment. Upon further substitution of Fe by Co the high sensitivity of the muon as a local magnetic probe reveals a magnetically disordered phase, in which the size of the moment continues to decrease and falls to zero around the same point at which the magnetically-driven structural distortion is no longer resolvable. Both magnetism and the structural distortion are weakened as the robust superconducting state is established.

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