Session A35: Focus Session: Iron Pnictides and Other Novel Superconductors I: Synthesis and New Materials

8:00 AM–11:00 AM, Monday, March 16, 2009
Room: 405

Sponsoring Unit: DMP
Chair: David Larbelestier, Florida State University

Abstract ID: BAPS.2009.MAR.A35.13

Abstract: A35.00013 : High-pressure growth of SmFeAsO$_{1-x}$ single crystals without fluorine doping

10:24 AM–10:36 AM

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Authors:

  Hyun-Sook Lee
    (Department of Physics, POSTECH)

  J.H. Park
    (Department of Physics, POSTECH)

  J.Y. Lee
    (Department of Physics, POSTECH)

  Hu-Jong Lee
    (Department of Physics, POSTECH)

  N.H. Sung
    (Materials Science and Engineering, GIST)

  J.Y. Kim
    (Materials Science and Engineering, GIST)

  B.K. Cho
    (Materials Science and Engineering, GIST)

  T.Y. Koo
    (Pohang Accelerator Laboratory)

  C.U. Jung
    (Department of Physics, Hankuk University of Foreign Studies)

We synthesized fluorine-free SmFeAsO$_{1-x}$ single crystals for a nominal value of $x$=0.15 at a pressure of 3.3 GPa and at a temperature of 1350-1450 $^{\circ}$C by using a self-flux method. Plate-shaped single crystals were obtained with the lateral size of a few-150 $\mu $m. Single crystals showed the superconducting transition at about 53.5 K with a narrow resistive transition width of 0.5 K. The synchrotron-irradiated X-ray diffractometry (XRD) peaks and the high-resolution scanning transmission electron microscopy (HR-STEM) images indicate the good crystallinity of our single crystals, which have a well-defined layered tetragonal structure. The chemical composition of the crystals was examined with the electron-probe X-ray microanalysis. A sharp transition, a low residual resistivity, and a large residual resistivity ratio indicate high quality of our single crystals. Fluorine-free single crystals of Fe-based superconductors are expected to provide an easier route to find the optimum conditions for the crystal formation in this family of materials.

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2009.MAR.A35.13