Effect of Fluctuations on Vortex Lattice Structural Transitions in Superconductors
A. Gurevich, V. G. Kogan
DOI 10.1103/PhysRevLett.87.177009 · Physical Review Letters
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Abstract
The rhombic-to-square transition field H□(T) for cubic and tetragonal materials in fields along [001] is evaluated using the nonlocal London theory with the account of thermal vortex fluctuations. Unlike extended Ginzburg-Landau models, our approach shows that the line H□(T) and the upper critical field Hc2(T) do not cross due to strong fluctuations near Hc2(T) which suppress the square anisotropy induced by the nonlocality. In increasing fields, fluctuations cause a reentrance of the rhombic vortex lattice, in agreement with recent neutron scattering data on borocarbides.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| LuNi2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 16 | Pressure not reported | unknown |
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