Flux growth at ambient pressure of millimeter-sized single crystals of LaFeAsO, LaFeAsO$_{1-x}$F$_{x}$, and LaFe$_{1-x}$Co$_{x}$AsO

ORAL

Abstract

Millimeter-sized single crystals of LaFeAsO, LaFeAsO$_{1-x}$F$_{x}$, and LaFe$_{1-x}$Co$_{x}$AsO were grown in NaAs flux at ambient pressure. The as-grown crystals have typical dimensions of 3 $\times$ 4 $\times$ 0.05-0.3 mm$^{3}$ with the crystallographic $c$-axis perpendicular to the plane of the plate-like single crystals. Various characterizations confirmed the high quality of our LaFeAsO crystals. Co and F were introduced into the lattice leading to superconducting LaFe$_{1-x}$Co$_{x}$AsO and LaFeAsO$_{1-x}$F$_{x}$ single crystals, respectively. The distribution and control of Co and F dopants will be discussed. - Ames Laboratory is operated for the US Department of Energy by Iowa State University under Contract No. DE-AC02-07CH11358.

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Authors

  • S. Nandi

  • J.L. Zarestky

  • W. Tian

  • A. Kreyssig

  • B. Jensen

  • A. Kracher

  • K.W. Dennis

  • Jiaqiang Yan

    • Ames Laboratory
    • Ames Laboratory and Department of Physics and Astronomy, Iowa State University
    • Ames Laboratory, Iowa State University

  • R.J. McQueeney

  • A.I. Goldman

  • R.W. McCallum

  • T.A. Lograsso

    • Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011