Specific heat and magnetization of a ZrB12 single crystal: Characterization of a type-II/1 superconductor
Yuxing Wang, Rolf Lortz, Yuriy Paderno, Vladimir Filippov, Satoko Abe, Ulrich Tutsch, Alain Junod
DOI 10.1103/PhysRevB.72.024548 · Physical Review B
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Abstract
We measured the specific heat, the magnetization, and the magnetoresistance of a single crystal of ZrB12, which is superconducting below Tc≅6K. The specific heat in zero field shows a BCS-type superconducting transition. The normal- to superconducting-state transition changes from first order (with a latent heat) to second order (without latent heat) with increasing magnetic field, indicating that the pure compound is a low-κ, type-II/1 superconductor in the classification of Auer and Ullmaier [Phys. Rev. B 7, 136 (1973)]. This behavior is confirmed by magnetization measurements. The H−T phase diagram based on specific-heat and magnetization data yields Hc2(0)=550G for the bulk upper critical field, whereas the critical field defined by vanishing resistance is a surface critical field Hc3(0)∼1000G.
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. | 5.91 | Pressure not reported | midpoint |
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 39 | Pressure not reported | unknown |
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