KxFe2-ySe2 single crystals: floating-zone growth, transport and structural properties
Publikation: Beitrag in Fachzeitschrift › Forschungsartikel › Beigetragen › Begutachtung
Beitragende
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
Originalsprache | Englisch |
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Aufsatznummer | 075001 |
Seitenumfang | 6 |
Fachzeitschrift | Superconductor Science and Technology |
Jahrgang | 25 |
Ausgabenummer | 7 |
Publikationsstatus | Veröffentlicht - Juli 2012 |
Peer-Review-Status | Ja |
Extern publiziert | Ja |
Externe IDs
Scopus | 84861586352 |
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Schlagworte
Schlagwörter
- SUPERCONDUCTIVITY