Effects of Two-Band Superconductivity on the Flux-Line Lattice in Magnesium Diboride
R. Cubitt, M. R. Eskildsen, C. D. Dewhurst, J. Jun, S. M. Kazakov, J. Karpinski
DOI 10.1103/PhysRevLett.91.047002 · Physical Review Letters
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Abstract
We present neutron scattering from the flux line lattice (FLL) in MgB2. Between 0.5 and 0.9 T the FLL undergoes a 30° reorientation, and simultaneously the scattered intensity falls sharply consistent with the weaker superconducting π band being suppressed with increasing field. We speculate that the π and σ bands favor different FLL orientations, and that the reorientation is driven by the suppression of the π band. When the c axis of the crystal is rotated 45° to the applied field the penetration depth anisotropy could be measured, and rises both as a function of applied field and temperature.
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. | — | Pressure not reported | unknown |
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