Dynamic melting of confined vortex matter

Details Dynamic melting of confined vortex matter Dynamic melting of confined vortex matter

2003-02-10

arxiv.org/abs/cond-mat/0302187v3

Physics

Condensed Matter

Superconductivity

Some small changes have been made. 4 pages, 4 figures included. Accepted for publication in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.91.177002

We study {\em dynamic} melting of confined vortex matter moving in disordered, mesoscopic channels by mode-locking experiments. The dynamic melting transition, characterized by a collapse of the mode-locking effect, strongly depends on the frequency, i.e. on the average velocity of the vortices. The associated dynamic ordering velocity diverges upon approaching the equilibrium melting line $T_{m,e}(B)$ as $v_c \sim (T_{m,e}-T)^{-1}$. The data provide the first direct evidence for velocity dependent melting and show that the phenomenon also takes place in a system under disordered confinement. \pacs{74.25.Qt,83.50.Ha,64.70.Dv,64.60.Ht}

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