T. Champel et Vp. Mineev, Theory of equilibrium flux lattice in UPt3 under magnetic field parallel to hexagonal crystal axis, PHYS REV L, 86(21), 2001, pp. 4903-4906
investigate Abrikosov lattice structures in the unconventional superconduct
or UPt3 under magnetic field parallel to the hexagonal crystal axis. Only t
he two-dimensional E-2 superconducting state among the many other states of
different symmetry is compatible with the recent observation [A. Huxley et
al.. Nature (London) 406, 160 (2000)] of the flux lattice in the A phase m
isaligned with crystallographic directions. It is shown that the inequality
of the London penetration depths in the basal plane directions resulting f
rom the superposition of hexagonal crystal and superconducting state anisot
ropies leads fur E-2 to a slightly distorted triangular flux lattice.