Flux growth at ambient pressure of millimeter-sized single crystals of LaFeAsO, LaFeAsO1-x Fx, and LaFe1-x Co x AsO

J. Q. Yan, S. Nandi, J. L. Zarestky, W. Tian, A. Kreyssig, B. Jensen, A. Kracher, K. W. Dennis, R. J. McQueeney, A. I. Goldman, R. W. McCallum, T. A. Lograsso

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Abstract

Millimeter-sized single crystals of LaFeAsO, LaFeAsO1-x F x, and LaFe1-x Cox AsO were grown in NaAs flux at ambient pressure. The detailed growth procedure and crystal characterizations are reported. The as-grown crystals have typical dimensions of 3×4×0.05-0.3 mm3 with the crystallographic c -axis perpendicular to the plane of the platelike single crystals. Various characterizations confirmed the high quality of our LaFeAsO crystals. Co and F were introduced into the lattice leading to superconducting LaFe1-x Cox AsO and LaFeAsO1-x Fx single crystals, respectively. This growth protocol is expected to be broadly applicable to grow other RMAsO (R=rare earth, M=transition metal) compounds.

Original languageEnglish
Article number222504
JournalApplied Physics Letters
Volume95
Issue number22
DOIs
StatePublished - 2009
Externally publishedYes

Funding

J.Q.Y. thanks Professor P. C. Canfield for fruitful discussions and for making part of the synthesis possible. The assistance of D. S. Robinson in performing the HEXRD studies at the APS is highly appreciated. S.N. thanks M. G. Kim for crystal orientation. Ames Laboratory is operated for the U.S. Department of Energy by Iowa State University under Contract No. DE-AC02-07CH11358. Use of the Advanced Photon Source was supported by U.S. DOE under Contract No. DE-AC02-06CH11357. The HFIR Center for Neutron Scattering is a national user facility funded by the United States Department of Energy, Office of Basic Energy Sciences, Materials Science, under Contract No. DE-AC05-00OR22725 with UT-Battelle.

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