Doping-induced superconductivity of ZrB${}_2$ and HfB${}_2$

Abstract

Unlike the widely studied $s$-type two-gap superconductor MgB${}_2$, the chemically similar compounds ZrB${}_2$ and HfB${}_2$ do not superconduct above 1 K. Yet, it has been shown that small amounts of self- or extrinsic doping (in particular with vanadium), can induce superconductivity in these materials. Based on results of different macro- and microscopic measurements, including magnetometry, nuclear magnetic resonance (NMR), resistivity, and muon-spin rotation ($\mu$SR), we present a comparative study of Zr${}_{0.96}$V${}_{0.04}$B${}_2$ and Hf${}_{0.97}$V${}_{0.03}$B${}_2$. Their key magnetic and superconducting features are determined and the results are considered within the theoretical framework of multiband superconductivity proposed for MgB${}_2$. Detailed Fermi surface (FS) and electronic structure calculations reveal the difference between MgB${}_2$ and transition-metal diborides.

arXiv comment10 pages, 8 figures

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• Review of Transition-Metal Diboride Thin Films
• Nodeless superconductivity and preserved time-reversal symmetry in the noncentrosymmetric Mo3P superconductor
• $Abinitio$ study of Li-Mg-B superconductors
• Ab initio modeling of superconducting alloys
• A first-principles investigation of the origin of superconductivity in TlBi${}_2$
• Machine-learning Guided Search for Phonon-mediated Superconductivity in Boron and Carbon Compounds
• Fully-gapped superconducting state in interstitial-carbon-doped Zr5Pt3