Evidence of multiband behavior in the superconducting alloy Zr${}_{0.96}$V${}_{0.04}$B${}_{2}$

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Evidence of multiband behavior in the superconducting alloy Zr $_{0.96}$ V $_{0.04}$ B $_{2}$

S. T. Renosto, H. Consoline, C. A. M. dos Santos, J. Albino Aguiar, Soon-Gil Jung, J. Vanacken, V. V. Moshchalkov, Z. Fisk, and A. J. S. Machado

Phys. Rev. B 87, 174502 – Published 6 May 2013

Abstract

ZrB $_{2}$ is a nonsuperconducting Pauli paramagnetic crystallizing in the AlB $_{2}$ structure. V substitution for Zr in Zr $_{1 - x}$ V $_{x}$ B $_{2}$ (0.01 $\leq$ $x$ $\leq$ 0.1) at the few percentage level induces superconductivity with critical temperature reaching a maximum of 8.7 K for Zr $_{0.96}$ V $_{0.04}$ B $_{2}$ near the solid solubility limit. Specific-heat and lower critical field temperature dependence results suggest the possibility of unconventional superconductivity possibly arising from multiband effects.

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Received 7 February 2013

DOI:https://doi.org/10.1103/PhysRevB.87.174502

Authors & Affiliations

S. T. Renosto^1,*, H. Consoline¹, C. A. M. dos Santos¹, J. Albino Aguiar², Soon-Gil Jung³, J. Vanacken³, V. V. Moshchalkov³, Z. Fisk⁴, and A. J. S. Machado¹

¹Escola de Engenharia de Lorena, Universidade de São Paulo, P.O. Box 116, Lorena, SP, Brazil
²Departamento de Física, Universidade Federal de Pernambuco, 50670-901, Recife, PE, Brazil
³Institute for Nanoscale Physics and Chemistry, K. U. Leuven Celest. 200 D, B-3001 Leuven, Belgium
⁴Department of Physics and Astronomy, University of California at Irvine, Irvine, California 92697, USA

^*renosto@usp.br

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Vol. 87, Iss. 17 — 1 May 2013

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