Crystal growth and characterization of FeAs-based superconductors

Hiroyuki Takeya, Shigeru Kasahara, Kazuto Hirata

Research output: Chapter in Book/Report/Conference proceedingConference contribution


FeAs-based single crystals of Ba1-xKxFe 2As2 and Sr1-xKxFe 2As2 were grown in a Mo capsule at the temperatures from 1200°C down to 850°C by a FeAs-self-flux method. Most of their sizes were approximately 0.2-0.5 mm. A larger single crystal of Sr Fe 2As2 about 7mm in diameter was obtained by the same procedure, as appeared in a round-shape. Most of the time, potassium-doped crystals tends to be smaller than undoped ones. An example of Tc for a Ba1-xKxFe2As2 single crystal measured with a SQUID magnetometer, which indicates Tc at 38 K. Tc s are sometimes lower dependent on the potassium composition. The substitution reaction between SrFe2As2 and potassium was examined. An undoped crystal absorbed potassium at around 600°C and showed superconductivity by the reaction.

Original languageEnglish
Title of host publicationTHERMEC 2009
EditorsTara Chandra, Tara Chandra, Tara Chandra, N. Wanderka, N. Wanderka, N. Wanderka, Walter Reimers, Walter Reimers, Walter Reimers, M. Ionescu, M. Ionescu, M. Ionescu
PublisherTrans Tech Publications Ltd
Number of pages4
ISBN (Print)0878492941, 9780878492947
Publication statusPublished - 2010
Externally publishedYes
Event6th International Conference on Processing and Manufacturing of Advanced Materials - THERMEC'2009 - Berlin, Germany
Duration: Aug 25 2009Aug 29 2009

Publication series

NameMaterials Science Forum
ISSN (Print)0255-5476
ISSN (Electronic)1662-9752


Other6th International Conference on Processing and Manufacturing of Advanced Materials - THERMEC'2009


  • Crystal growth
  • Iron-arsenides
  • Superconductor

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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