Phys. Rev. Lett. 87, 177009 (2001) [4 pages]Effect of Fluctuations on Vortex Lattice Structural Transitions in SuperconductorsReceived 5 June 2001; published 9 October 2001 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. © 2001 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.87.177009
DOI:
10.1103/PhysRevLett.87.177009
PACS:
74.60.Ge, 74.70.Dd
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