KxFe2-ySe2 single crystals: floating-zone growth, transport and structural properties
Research output: Contribution to journal › Research article › Contributed › peer-review
Contributors
Abstract
Single crystals of superconducting KxFe2-ySe2 have been grown with the optical floating-zone technique under application of 8 bar of argon pressure. We found that large and high quality single crystals with dimensions of similar to 6 mm x 10 mm could be obtained at the termination of the grown ingot through quenching, while the remaining part of the ingot decomposed. As-grown single crystals commonly represent an intergrowth of two sets of c-axes characterized by slightly different lattice constants. Single-crystal K0.80Fe1.81Se2 shows a superconducting transition at T-c = 31.6 K, leading to a near 100% expulsion of the external magnetic field in magnetization measurements. On the other hand, neutron diffraction data indicate that superconductivity in the sample coexists with a root 5 x root 5 iron-vacancy superstructure and static antiferromagnetic order. The anisotropic ratio of the upper critical field H-c2 for both H parallel to c and H parallel to ab configurations is similar to 3.46.
Details
Original language | English |
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Article number | 075001 |
Number of pages | 6 |
Journal | Superconductor Science and Technology |
Volume | 25 |
Issue number | 7 |
Publication status | Published - Jul 2012 |
Peer-reviewed | Yes |
Externally published | Yes |
External IDs
Scopus | 84861586352 |
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Keywords
Keywords
- SUPERCONDUCTIVITY