Electrical transport and anisotropic superconducting properties in single crystalline and dense polycrystalline MgB2
A. K. Pradhan, Z. X. Shi, M. Tokunaga, T. Tamegai, Y. Takano, K. Togano, H. Kito, H. Ihara
DOI 10.1103/PhysRevB.64.212509 · Physical Review B
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Abstract
The transport properties of dense polycrystalline and single-crystalline MgB2 platelets have been measured to determine the effects of grain size on the upper critical field Hc2 and the anisotropy parameter. The Hc2 in polycrystalline MgB2 is enhanced and the magnetic-field-induced broadening is significantly reduced with increasing grain size, probably due to reduced contamination at the grain boundaries. Single-crystalline MgB2 exhibits remarkable anisotropy in Hc2(T) and irreversibility field H*(T) with anisotropy γ=Hc2ab/Hc2c∼3±0.2. The large broadening of the superconducting transition for the H||c direction indicates a significant suppression of H*(T) below Hc2c, giving H*c(T)∼0.71Hc2c(T).
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 39 | Pressure not reported | unknown |
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 38.2 | Pressure not reported | onset |
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 38.2 | Pressure not reported | onset |
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