ISSN:
1573-7357
Keywords:
74.25.Fy
;
74.40.+k
;
74.60.Ge
;
74.72.Bk
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract Magnetotransport measurements on a clean, untwinned YBa2Cu3O7−δ single crystal show that the vortex dynamics at temperatures just below the vortex lattice melting transition are highly dependent on the type of modulation of the probing current. While in the case of DC current the flux flow is disordered, the “shaking” of the vortex lattice by a square-wave current leads to a more uniform vortex motion. A small asymmetry (∼10%) in the durations of the positive and negative parts of the square-wave period induces periodical oscillations of the voltage response amplitude. The period of oscillations (∼100 s) is the same order of magnitude as the time needed for vortices to cross the sample (transit time). We relate the observed voltage oscillations to a periodically ordered vortex motion.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00753854
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