Doping-induced superconductivity of ZrB2 and HfB2
N. Barbero, T. Shiroka, B. Delley, T. Grant, A. J. S. Machado, Z. Fisk, H.-R. Ott, J. Mesot
DOI 10.1103/PhysRevB.95.094505 · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
Unlike the widely studied s-type two-gap superconductor MgB2, the chemically similar compounds ZrB2 and HfB2 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 macroscopic and microscopic measurements, including magnetometry, nuclear magnetic resonance (NMR), resistivity, and muon-spin rotation (μ+SR), we present a comparative study of Zr0.96V0.04B2 and Hf0.97V0.03B2. Their key magnetic and superconducting features are determined and the results are considered within the theoretical framework of multiband superconductivity proposed for MgB2. Detailed Fermi surface (FS) and electronic structure calculations reveal the difference between MgB2 and transition-metal diborides.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Zr0.96V0.04B2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8.33 | Pressure not reported | onset |
| Hf0.97V0.03B2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7.31 | Pressure not reported | onset |
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 39 | Pressure not reported | unknown |
Similar papers
Superconductivity of Metallic Boron in MgB2
similarity 0.96J. Kortus et al.
Source status unknown — claims are unverified
Superconductivity, superstructure, and structure anomalies in Mg1−xAlxB2
similarity 0.96J. Q. Li et al.
Source status unknown — claims are unverified
Superconductivity of MgB2 under ultrahigh pressure: A first-principles study
similarity 0.96Yanchao Wang et al.
Source status unknown — claims are unverified
Electron-phonon coupling and two-band superconductivity of Al- and C-doped MgB2
similarity 0.96O. De la Peña-Seaman et al.
Source status unknown — claims are unverified
Superconducting properties of BeB2.75
similarity 0.96D. P. Young et al.
Source status unknown — claims are unverified
Influence of bonding on superconductivity in high-pressure hydrides
similarity 0.96Christoph Heil & Lilia Boeri
Source status unknown — claims are unverified