Irreversibility in Rolled Tantalum.
- Resource Type
- Article
- Authors
- Sandu, V.; Cimpoiasu, Elena
- Source
- Journal of Superconductivity & Novel Magnetism. Jul2018, Vol. 31 Issue 7, p2047-2054. 8p.
- Subject
- *TANTALUM
*MAGNETIC properties
*THERMODYNAMICS
*SUPERCONDUCTIVITY
*HEAT capacity
*MAGNETIZATION
*MAGNETIC relaxation
- Language
- ISSN
- 1557-1939
We investigated the magnetic and thermodynamic properties of rolled tantalum in superconducting state. The magnetization shows a crossover from type I to type II superconductivity as the magnetic field increases beyond the thermodynamic critical field. In both regimes, the sample shows a substantial irreversibility of the magnetization which we attribute to the pinning of the entities that characterize the intermediate and mixed states. Magnetic relaxation data taken in the intermediate state shows an important contribution of the quantum tunnelling below 3.7 K. [ABSTRACT FROM AUTHOR]