Abstract
We report on syntheses and electron transport properties of polycrystalline samples of diborides (AB2) with different transition metals atoms (A=Zr, Nb, Ta). The temperature dependence of resistivity, ρ(T), and ac susceptibility of these samples reveal a superconducting transition of ZrB2 with T c =5.5 K, while NbB2 and TaB2 have been observed to be nonsuperconducting up to 0.37K. H c2(T) is linear in temperature below T c , leading to a rather low H c2(0)=0.1 T. At T close to T c , H c2(T) demonstrates a downward curvature. We conclude that these diborides, as well as MgB2 samples, behave like simple metals in the normal state with usual Bloch-Grüneisen temperature dependence of resistivity and with Debye temperatures 280, 460, and 440 K for ZrB2, NbB2, and MgB2, respectively, rather than T 2 and T 3, as previously reported for MgB2.
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From Pis’ma v Zhurnal Éksperimental’no\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) i Teoretichesko\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) Fiziki, Vol. 73, No. 10, 2001, pp. 601–604.
Original English Text Copyright © 2001 by Gasparov, Sidorov, Zver’kova, Kulakov.
This article was submitted by the authors in English.