We study the dynamics of dilute vortices in c-axis oriented Y-123, Hg-, and Tl-1212 thin films, as well as a-axis oriented Hg-1212 thin films. Results on the Hg- and Tl-1212 thin films indicate that dislocation-mediated plastic flux creep of single vortices dominates at low temperatures and fields. As the temperature (or the field) is increased, increasing vortex–vortex interactions promote a collective behavior, characterized by elastic creep with a nonzero μ exponent. In some samples, effects of thermally assisted quantum creep are visible up to 45 K. In Y-123 thin films, creep is collective down to the lowest temperatures and fields investigated, while quantum creep persists up to 10–11 K.
REFERENCES
1.
2.
D. S.
Fisher
, M. P.
Fischer
, and D. A.
Huse
, Phys. Rev. B
43
, 130
(1991
).3.
4.
5.
6.
G.
Blatter
and V.
Geshkenbein
, Phys. Rev. Lett.
77
, 4958
(1996
).7.
8.
H. A.
Radovan
, H. H.
Wen
, and P.
Ziemann
, Eur. Phys. J. B
7
, 533
(1999
).9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
H. A.
Radovan
, H. H.
Wen
, and P.
Ziemann
, Eur. Phys. J. B
7
, 533
(1999
).22.
23.
24.
25.
26.
27.
28.
29.
30.
31.
32.
This content is only available via PDF.
© 2002 American Institute of Physics.
2002
American Institute of Physics
You do not currently have access to this content.
