Unusual noise in the magnetization relaxation in MgB2 superconductors
A. Mumtaz, W. Setyawan, S. A. Shaheen
DOI 10.1103/PhysRevB.65.020503 · Physical Review B
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Abstract
Magnetization relaxation studies have been made on MgB2 powders as a function of magnetic field and temperature. An H−T phase diagram is constructed representing different regimes of flux dynamics. It is found that at high temperature and field the magnetization relaxation, m(t) is logarithmic and follows the Anderson-Kim behavior. At low T (T<10K) and moderate fields (4kOe<H<8kOe), it becomes nonlogarithmic. The most interesting region of flux creep is, however, at low T and low H, where it is observed that the magnetization at fixed field and temperature becomes noisy. The noise levels are much larger than our superconducting quantum interference device resolution.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 38 | Pressure not reported | unknown |
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 39 | Pressure not reported | unknown |
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