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Electron transport, penetration depth, and the upper critical magnetic field in ZrB12 and MgB2

  • Order, Disorder, and Phase Transitions in Condensed Systems
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Abstract

We report on the synthesis and measurements of the temperature dependences of the resistivity ρ, the penetration depth λ, and the upper critical magnetic field H c2, for polycrystalline samples of dodecaboride ZrB12 and diboride MgB2. We conclude that ZrB12 behaves as a simple metal in the normal state with the usual Bloch-Grüneisen temperature dependence of ρ(T) and with a rather low resistive Debye temperature T R = 280 K (to be compared to T R = 900 K for MgB2). The ρ(T) and λ(T) dependences for these samples reveal a superconducting transition in ZrB12 at T c = 6.0 K. Although a clear exponential λ(T) dependence in MgB2 thin films and ceramic pellets was observed at low temperatures, this dependence was almost linear for ZrB12 below T c/2. These features indicate an s-wave pairing state in MgB2, whereas a d-wave pairing state is possible in ZrB12. In disagreement with conventional theories, we found a linear temperature dependence, of H c2(T) for ZrB12 (H c2(0) = 0.15 T).

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Authors and Affiliations

  1. Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Moscow oblast, 142432, Russia

    V. A. Gasparov, N. S. Sidorov, I. I. Zver’kova, S. S. Khassanov & M. P. Kulakov

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  1. V. A. Gasparov
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  2. N. S. Sidorov
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  3. I. I. Zver’kova
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  4. S. S. Khassanov
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  5. M. P. Kulakov
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Additional information

From Zhurnal Éksperimental’no\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) i Teoretichesko\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) Fiziki, Vol. 128, No. 1, 2005, pp. 115–124.

Original English Text Copyright © 2005 by Gasparov, Sidorov, Zver’kova, Khassanov, Kulakov.

This article was submitted by the authors in English.

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Gasparov, V.A., Sidorov, N.S., Zver’kova, I.I. et al. Electron transport, penetration depth, and the upper critical magnetic field in ZrB12 and MgB2 . J. Exp. Theor. Phys. 101, 98–106 (2005). https://doi.org/10.1134/1.2010666

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  • DOI: https://doi.org/10.1134/1.2010666

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