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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 T_c=15.5 K with the width Δ T_c=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.