Coherence lengths and anisotropy in MgB2 superconductor
A. Dulčić, M. Požek, D. Paar, Eun-Mi Choi, Hyun-Jung Kim, W. N. Kang, Sung-Ik Lee
DOI 10.1103/PhysRevB.67.020507 · Physical Review B
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Abstract
Field- and temperature-dependent microwave measurements have been carried out on MgB2 thin film grown on Al2O3 substrate. The analysis reveals the mean-field coherence length ξMF in the mixed state and a temperature-independent anisotropy ratio γMF=ξMFab/ξMFc≈2. At the superconducting transition, the scaling of the fluctuation conductivity yields the Ginzburg-Landau coherence length with a different anisotropy ratio γGL=2.8, also temperature independent.
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. | 33.8 | Pressure not reported | onset |
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