Journal
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
Volume 22, Issue 7, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0953-2048/22/7/075023
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Funding
- Korea Science and Engineering Foundation (KOSEF) [R17-2008007-01001-0, R15-2008-006-01002-0, R01-2006-000-11071-0]
- POSCO Technical Research Laboratory through Steel Nanoscience Program
- KRF [KRF-2007-331-C00100]
- National Research Foundation of Korea [R01-2006-000-11071-0, 2007-331-C00100] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Fluorine-free SmFeAsO1-x single crystals of a nominal composition with x = 0.15 were grown under the pressure of 3.3 GPa and at 1350-1450C by using the self-flux method. Plate-shaped crystals of a few-200 mu m in lateral size were obtained. The resistively determined superconducting transition of a single crystal was at about 53.5 K, with a narrow resistive transition width of 0.5 K. The detailed crystal structure was analyzed by using synchrotron-irradiated x-ray diffractometry and high-resolution scanning transmission electron microscopy. A sharp transition, a low residual resistivity, and a large residual resistivity ratio indicate the high quality of our single crystals. The temperature and magnetic field dependences of the magnetization also confirmed the absence of extrinsic impurity phases.
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