Dresden 2006 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 7: Superconductivity & Solids At Low Temperature - Poster Session
TT 7.3: Poster
Montag, 27. März 2006, 14:00–17:45, P1
Superconducting and magnetic properties of RENi2B2C (RE=Y, Tb, Ho, Tm) single crystals — •Dmitri Souptel1, Gunter Behr1, Wolfgang Loser1, Gunter Fuchs1, Tilmann Leisegang2, and Dirk Meyer2 — 1Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden, Helmholtzstr. 20, 01171 Dresden — 2Technische Universität Dresden, Institut für Strukturphysik D-01062 Dresden
High-quality single crystals of RENi2B2C (RE=Y, Tb, Ho, Tm) intermetallic compounds have been grown by a floating zone technique with optical heating [1, 2]. Crystals are crack free, without traces of 2nd phases and single crystalline in the volumes of 6 mm in diameter and 25-40 mm in length. The high crystal perfection was confirmed by x-ray, metallographic and neutron methods. Physical properties depend strongly on small composition variation and the temperature of heat treatment. For instance HoNi2B2C show a variety of properties: plain superconductivity (Tc about 8 K), re-entrant superconductivity (Tc about 8 K and loss of superconductivity between 4 - 6 K due to incommensurate magnetic ordering) and normal conducting behaviour. Origins of different superconducting properties and their anisotropic behaviour are related to crystal composition, lattice parameters and changes of lattice site occupancies of the composing elements.
[1] D. Souptel et al., J. Cryst. Growth 276 (3-4) (2005) 652-662 [2] D. Souptel et al., J. Cryst. Growth 275 (1-2) (2005) e91-e95