Specific Heat and Tunneling Spectroscopy Study of NbB<SUB>2</SUB> with Maximum <I>T</I><SUB>c</SUB>∼10 K

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  • Kuroiwa Sogo
    Department of Physics and Mathematics, Aoyama Gakuin University
  • Tomita Yoko
    Department of Physics and Mathematics, Aoyama Gakuin University
  • Sugimoto Akira
    Graduate School of Integrated Arts and Sciences, Hiroshima University
  • Ekino Toshikazu
    Graduate School of Integrated Arts and Sciences, Hiroshima University
  • Akimitsu Jun
    Department of Physics and Mathematics, Aoyama Gakuin University

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  • Specific heat and tunneling spectroscopy study of NbB2 with maximum Tc～10K

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Abstract

We report on magnetic, transport, specific heat and tunneling measurements of NbB2 with the maximum superconducting critical temperature Tc∼10 K. The essential superconducting properties have been investigated through mapping out the critical field phase diagram, from which it is turned out to be type II superconductor with a small Ginzbrug–Landau parameter κ∼2.2. Both the tunneling and specific heat measurements indicate that our NbB2 specimen has a single gap and s-wave pairing symmetry with a weak-coupling limit. The electron–phonon coupling constant is estimated to be λep=0.71±0.02, suggesting that the maximum Tc of NbB2 can be explained by the McMillan formula.

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