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Study of the New Superconducting Compound Zr0.97V0.03B2 with Point-Contact Spectroscopy

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Abstract

We present a study of the superconducting energy gap performed with point contact spectroscopy in a single crystal of the superconductor Zr0.97V0.03B2. We determined the size and evolution with temperature of the energy gap, the transition temperature in the compound occurs at the onset of T ≈ 9.3 K. The point contact junctions were measured from 1.7 to 20 K. The differential conductance as a function of bias voltage was analyzed with the Blonder-Tinkham-Klapwijk model, the evolution of the gap with temperature was compared with the BCS theory, the ratio 2 Δ(0)/K B T C was of the order of 8.95 indicative of a very strong coupling limit.

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Acknowledgments

This work was partially supported by grants by DGAPA-UNAM project IN106014, CONACyT México. López-Romero thanks to CONACyT-México for a scholarship and DGAPA-UNAM, IN106014. We also thanks Joaquín Morales, Alberto López, R. Reyes, and F. Silvar for technical support and helium provisions.

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Authors and Affiliations

  1. Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, A. Postal 70-360, México, D.F. 04510, Mexico

    Rodolfo E. López-Romero & R. Escudero

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  1. Rodolfo E. López-Romero
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  2. R. Escudero
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Correspondence to R. Escudero.

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López-Romero, R.E., Escudero, R. Study of the New Superconducting Compound Zr0.97V0.03B2 with Point-Contact Spectroscopy. J Supercond Nov Magn 28, 2953–2957 (2015). https://doi.org/10.1007/s10948-015-3137-z

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  • DOI: https://doi.org/10.1007/s10948-015-3137-z

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