Regensburg 2004 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 8: Postersitzung I: Supraleitung
TT 8.50: Poster
Montag, 8. März 2004, 14:30–19:00, Poster A
Crystal growth, perfection and selected physical properties of RENi2B2C (RE=Y, Tb, Ho) — •Dmitri Souptel1, Günter Behr1, Wolfgang Löser1, Günter Fuchs1, Konstantin Nenkov1, and Andreas Kreyssig2 — 1IFW Dresden, Helmholtzstr. 20, 01171 Dresden — 2IAPD, TU Dresden, 01062 Dresden
Single crystals of HoNi2B2C, YNi2B2C and TbNi2B2C intermetallic compounds have been grown by a floating zone technique with optical heating. 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.
YNi2B2C shows superconducting transition temperature Tc=15.5 K with the width Δ Tc=0.1-0.2 K and RRR=35-39. HoNi2B2C single crystals exhibit a variety of physical properties. For the first time, macroscopic single crystalline samples with zero-field re-entrant superconductivity were prepared. Origins of variations of superconducting properties have been related to composition, lattice parameters and local resistance ratio measurements of crystal sections. The results corroborate the existence of a finite homogeneity range of the HoNi2B2C intermetallic compound.