Low-field magnetic relaxation effects in high-Tc superconductors Sr-La-Cu-O and Ba-La-Cu-O
A. C. Mota, A. Pollini, P. Visani, K. A. Müller, J. G. Bednorz
DOI 10.1103/PhysRevB.36.4011 · Physical Review B
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Abstract
The relaxation of the isothermal dc magnetization M in zero-field-cooled Ba-La-Cu-O and Sr-La-Cu-O has been investigated. After the external magnetic field has been changed or cycled, the resultant magnetization M decays following the law M∝ln(tt0) with great accuracy over an observation time period of four decades. At H=0, the logarithmic decay rate ∂M∂lnt is proportional to the temperature T and it is also proportional to Hi3. Here Hi is the external field which is reduced to zero before the decay rate of persistent currents is observed.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ba0.15La1.85CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 9 | Pressure not reported | onset |
| Sr0.2La1.8CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 9 | Pressure not reported | onset |
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