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VOLUME 80 | ISSUE 5 | PAGE 376
On electron transport in ZrB 12, ZrB2 and MgB2 in normal state
V. A. Gasparov, M. P. Kulakov, N. S. Sidorov, I. I. Zver'kova, V. B. Filipov+, A. B. Lyashenko+, Yu. B. Paderno+
Institute of Solid State Physics RAS, 142432 Chernogolovka, Moscow District, Russia
+Institute for Problems of Material Science NANU, Kiev, Ukraine


PACS: 72.15.Gd, 74.60.Ec, 74.70.Ad
Abstract
We report on measurements of the temperature dependence of resistivity, ρ(T), for single crystal samples of ZrB12, ZrB2 and polycrystalline samples of MgB2. It is shown that cluster compound ZrB12 behaves like a simple metal in the normal state, with a typical Bloch - Grüneisen ρ(T) dependence. However, the resistive Debye temperature, TR=300 K, is three times smaller than TD obtained from specific heat data. We observe the T2 term in ρ(T) of all these borides, which could be interpreted as an indication of strong electron-electron interaction.


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