Ferromagnetic Quantum Critical Point in FeGa3 Tuned by Mixed-Valence Fe Dimers

N. Haldolaarachchige; J. Prestigiacomo; W. Adam Phelan; Y. M. Xiong; Greg McCandless; Julia Y. Chan; J. F. DiTusa; I. Vekhter; S. Stadler; D. E. Sheehy; P. W. Adams; D. P. Young

Ferromagnetic Quantum Critical Point in FeGa3 Tuned by Mixed-Valence Fe Dimers

Strongly Correlated Electrons 2013-04-09 v1

Authors: N. Haldolaarachchige , J. Prestigiacomo , W. Adam Phelan , Y. M. Xiong , Greg McCandless , Julia Y. Chan , J. F. DiTusa , I. Vekhter , S. Stadler , D. E. Sheehy , P. W. Adams , D. P. Young

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Abstract

The magnetic, transport, and thermal properties of single crystals of the series Fe(Ga1-xGex)3 are reported. Pure FeGa3 is a nonmagnetic semiconductor, that when doped with small concentrations of Ge (extrinsic electrons), passes through an insulator-to-metal transition and displays non-Fermi liquid (NFL) behavior. Moreover, we observer clear signatures of a ferromagnetic quantum critical point (FM-QCP) in this system at x = 0.052. The mechanism of the local moment formation is consistent with a one-electron reduction of Fe dimer singlets, a unique structural feature in FeGa3, where the density of these mixed valence (Fe(III)-Fe(II)) dimers provides a unique tuning parameter of quantum criticality.

Keywords

ferromagnetic quantum critical point FeGa3 mixed-valence Fe dimers non-Fermi liquid insulator-metal transition quantum criticality

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@article{arxiv.1304.1897,
  title  = {Ferromagnetic Quantum Critical Point in FeGa3 Tuned by Mixed-Valence Fe Dimers},
  author = {N. Haldolaarachchige and J. Prestigiacomo and W. Adam Phelan and Y. M. Xiong and Greg McCandless and Julia Y. Chan and J. F. DiTusa and I. Vekhter and S. Stadler and D. E. Sheehy and P. W. Adams and D. P. Young},
  journal= {arXiv preprint arXiv:1304.1897},
  year   = {2013}
}

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15 Pages, 7 Figs

Ferromagnetic Quantum Critical Point in FeGa3 Tuned by Mixed-Valence Fe Dimers

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