| Autor: |
Wolfgang Treimer, O. Ebrahimi, Indu Dhiman, H. Höppner, R. Ziesche, N. Karakas |
| Rok vydání: |
2015 |
| Předmět: |
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| Zdroj: |
Physics Procedia. 69:420-426 |
| ISSN: |
1875-3892 |
| DOI: |
10.1016/j.phpro.2015.07.059 |
| Popis: |
The evolution of flux trap behavior at low temperature (the intermediate state) in high purity Lead samples, both in single crystal with orientation and polycrystalline form, is investigated using field cooled (FC) neutron tomography measurements. Reported measurements are carried out for 0∘ and 90∘ sample axis orientation with respect to the external magnetic field. For both Pb single crystal as well as polycrystalline sample development of fringe pattern below T T c (at 5K) is observed. This shows magnetic field trapped within the sample. On increasing the temperature to 7.5 K for T > T c, fringe pattern inside the sample disappears, indicating that the sample attains a normal state. Further comparison of mosaic spread values for Pb crystal and our previously reported Pb crystal indicate the feeble role played by dislocations and / or defects [Phys. Rev. B 85 184522 (2012)]. Interestingly, not only the field cooled superconducting state appears distinct for each sample, dependent on the crystal structure - single crystal or polycrystalline, but also on the applied magnetic field orientation with respect to the crystallographic sample axis. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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