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Cigarroa, O.
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article
Study of the superconducting properties of the new intermetallic compound Zr1-xNbxB2
Abstract
<p>In this paper we report on the synthesis and the structural, electrical, magnetic and thermal analysis for the new material Zr<sub>1-x</sub>Nb<sub>x</sub>B<sub>2</sub>(0.01 ≤ x ≤ 0.05). A superconducting transition was observed for all x values studied, despite the non-superconducting matrix ZrB<sub>2</sub>, which indicates that the superconducting state is induced by the presence of Nb. The results show that the critical temperature increases with Nb content, reaching its maximum (T<sub>c</sub> = 8.1 K) for x = 0.04. From the specific heat data we find a Sommerfeld constant of γ = 1.6 mJ molK<sup>-2</sup> and a Debye temperature of θ<sub>D</sub> = 615.5 K. Unconventional behaviors are observed in specific heat dependence with temperature and in H<sub>c1</sub>(T) diagram. These behaviors are investigated in C<sub>e</sub>/T versus T curve, where an upturn appears for T < 2.3 K, and in ln (C<sub>e</sub>/γT<sub>c</sub>) versus T<sub>c</sub>/T dependence, which shows a clear deviation from BCS theory for low temperatures. Also, contrary to the conventional theories we found a positive curvature for temperatures near T<sub>c</sub> in the lower critical field, besides an upturn around 2.3 K. We suggest that these behaviors possibly arise from multiband superconductivity in Zr<sub>0.96</sub>Nb<sub>0.04</sub>B<sub>2</sub>.</p>