Checkerboard patterns of charge stripes in the two-gap superconductor ZrB12
N. B. Bolotina, O. N. Khrykina, A. N. Azarevich, N. Yu. Shitsevalova, V. B. Filipov, S. Yu. Gavrilkin, K. V. Mitsen, V. V. Voronov, N. E. Sluchanko
DOI 10.1103/PhysRevB.105.054511 · Physical Review B
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Abstract
Inhomogeneous superconductivity was studied in ZrB12 (Tc≈6K) using heat capacity and x-ray diffraction data. Evidence of two-band superconductivity with two branches of upper critical field Hc2(Tc) is obtained in a magnetic field applied along the [110] axis of the crystal. On the contrary, at H || [100], a single dependence Hc2(Tc) was observed. This finding is consistent with the checkerboard-type patterns observed on the difference Fourier maps of the electron density distribution. These patterns are compared to those for the weakly coupled superconductor LuB12, Tc of which is 15 times lower than that of ZrB12. The probable nature of the two-gap superconductivity in ZrB12 is discussed.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| ZrB12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6 | Pressure not reported | onset |
| LuB12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.42 | Pressure not reported | unknown |
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