Journal
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
Volume 22, Issue 10, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0953-2048/22/10/105006
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Co-doped iron arsenic single crystals of BaFe1.87Co0.13As2 with dimensions up to 20 x 10 x 2 mm(3) were grown using a nucleation pole: an alumina stick served as a nucleation center during growth. The high quality of the crystals was illustrated using measured neutron rocking curves and x-ray diffraction patterns. A very sharp superconducting transition temperature of T-c similar to 25 K was revealed by both resistivity and susceptibility measurements. A nearly 100% shielding fraction and the bulk nature of the superconductivity for the single crystals were confirmed using magnetic susceptibility data.
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