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- Title
Electron Transport in Diborides: Observation of Superconductivity in ZrB[sub 2].
- Authors
Gasparov, V. A.; Sidorov, N. S.; Zver’kova, I. I.; Kulakov, M. P.
- Abstract
We report on syntheses and electron transport properties of polycrystalline samples of diborides (AB[sub 2]) 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 ZrB[sub 2] with T[sub c] = 5.5 K, while NbB[sub 2] and TaB[sub 2] have been observed to be nonsuperconducting up to 0.37K. H[sub c][sub 2](T) is linear in temperature below T[sub c], leading to a rather low H[sub c][sub 2](0) = 0.1 T. At T close to T[sub c],H[sub c][sub 2](T) demonstrates a downward curvature. We conclude that these diborides, as well as MgB[sub 2] 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 ZrB[sub 2],NbB[sub 2], and MgB[sub 2], respectively, rather than T [sup 2] and T [sup 3], as previously reported for MgB[sub 2]. © 2001 MAIK “Nauka / Interperiodica”.
- Subjects
ELECTRON transport; SUPERCONDUCTIVITY; BORIDES; ZIRCONIUM compounds
- Publication
JETP Letters, 2001, Vol 73, Issue 10, p532
- ISSN
0021-3640
- Publication type
Article
- DOI
10.1134/1.1387521