The phase transition
between two quantized vortices was mapped in the pT-plane
using magnetization and susceptibility anisotropy of the
core structures [PRL 53, 584 (1984)].
Strong metastability over the re-entrantly shaped
transition line was observed indicating first-order
nature of the phase transition.
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The first-order
phase transition in the core structure of quantized
vortices, first observed using NMR methods, was
investigated in this work in more detail using both
the NMR and gyroscopic techniques.
Re-entrant shape of the transition curve on the pT
plane was observed in both experimental
investigations. The gyropscopic experiments revealed
that, besides discontinuous magnetic properties, the
two vortex types display clearly different critical
flow velocities. At the time of this work, only the vortex present in regions I and III could be identified. According to Ginzburg-Landau theory, this vortex has a core occupied by A-phase liquid, which is responsible for the susceptibility anisotropy and by ferromagnetic -phase liquid, with spontaneous magnetization. |