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Magnetic flux noise in Mg B 2 superconductor
Magnetic flux noise in Mg B 2 polycrystalline sample is measured using a high- T C rf-superconducting quantum interference device in the temperature range of 6 - 40 K . A small magnetic field ( ∼ 200 mG ) was applied while cooling the sample. The flux noise exhibits 1 ∕ f α type of behavior with α ∼...
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| Published in: | Applied physics letters 2008-05, Vol.92 (19), p.192508-192508-3 |
|---|---|
| Main Authors: | , , |
| Format: | Article |
| Language: | |
| Citations: | Items that this one cites |
| Online Access: | Get full text |
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| Summary: | Magnetic flux noise in
Mg
B
2
polycrystalline sample is measured using a high-
T
C
rf-superconducting quantum interference device in the temperature range of
6
-
40
K
. A small magnetic field
(
∼
200
mG
)
was applied while cooling the sample. The flux noise exhibits
1
∕
f
α
type of behavior with
α
∼
1.0
-
1.3
and shows enhanced noise around 24 and
37
K
. The flux noise seems to originate from thermally activated vortex hopping. The large magnetic noise at
24
K
indicates the presence of larger density of pinning sites with energies
∼
0.061
eV
leading to enhanced magnetic fluctuations at temperatures much below
T
C
. |
|---|---|
| ISSN: | 0003-6951 1077-3118 |
| DOI: | 10.1063/1.2924309 |