Two-dimensional electron-gas-like charge transport at magnetic Heusler alloy-SrTiO$_3$ interface

P. K. Rout; Himanshu Pandey; Lijun Wu; Anupam; P. C. Joshi; Z. Hossain; Yimei Zhu; R. C. Budhani

doi:10.1103/PhysRevB.89.020401

Two-dimensional electron-gas-like charge transport at magnetic Heusler alloy-SrTiO$_3$ interface

Materials Science 2014-01-07 v2

Authors: P. K. Rout , Himanshu Pandey , Lijun Wu , Anupam , P. C. Joshi , Z. Hossain , Yimei Zhu , R. C. Budhani

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Abstract

We report remarkably low residual resistivity, giant residual resistivity ratio, free-electron-like Hall resistivity and high mobility ( $\approx$ 10 $^4$ cm $^2$ V $^{-1}$ s $^{-1}$ ) charge transport in epitaxial films of Co $_2$ MnSi and Co $_2$ FeSi grown on (001) SrTiO $_3$ . This unusual behavior is not observed in films deposited on other cubic oxide substrates of comparable lattice parameters. The scaling of the resistivity with thickness of the films allow extraction of interface conductance, which can be attributed to a layer of oxygen vacancies confined within 1.9 nm of the interface as revealed by atomically resolved electron microscopy and spectroscopy. The high mobility transport observed here at the interface of a fully spin polarized metal is potentially important for spintronics applications.

Keywords

two-dimensional electron gas Heusler alloy SrTiO3 interface charge transport high mobility spintronics oxygen vacancies epitaxial films

Cite

@article{arxiv.1208.3099,
  title  = {Two-dimensional electron-gas-like charge transport at magnetic Heusler alloy-SrTiO$_3$ interface},
  author = {P. K. Rout and Himanshu Pandey and Lijun Wu and Anupam and P. C. Joshi and Z. Hossain and Yimei Zhu and R. C. Budhani},
  journal= {arXiv preprint arXiv:1208.3099},
  year   = {2014}
}

Two-dimensional electron-gas-like charge transport at magnetic Heusler alloy-SrTiO$_3$ interface

Abstract

Keywords

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