Journal article
Defining B-c, B* and B-phi for YBCO Thin Films
University of Turku1
Nano-Microstructures in Materials, Materials Research Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark2
Materials Research Division, Risø National Laboratory for Sustainable Energy, Technical University of Denmark3
Risø National Laboratory for Sustainable Energy, Technical University of Denmark4
The accommodation field, B* , is generally defined to be the field at which the cross over from single vortex pinning to collective pinning occurs. It is determined from magnetization curves as the point where the J c plateau ends and it used as a convenient way of comparing the pinning properties of superconducting films.
Similarly, the characteristic field, B c, can be obtained from magneto-optical (MO) images from when the flux fronts meet in the middle of the film. The matching field, B phi, at which there is one vortex line per pinning site, is sometimes thought to be the same as B*, but in BaZrO3-doped YBa2Cu3O7 films the calculated B phi is much higher than the observed B*.
B phi can be determined from angular dependent transport measurements. All of the field values correspond to some special case in the flux pinning in the film and relate to J c. In this work we have determined B c, B* and B phi for different kinds of YBCO films using MO, magnetization and transport measurements to reveal the deeper meaning of the special fields.
| Language: | English |
|---|---|
| Publisher: | IEEE |
| Year: | 2009 |
| Pages: | 3431-3434 |
| ISSN: | 15582515 , 10518223 and 23787074 |
| Types: | Journal article |
| DOI: | 10.1109/TASC.2009.2019095 |
| ORCIDs: | Abrahamsen, Asger Bech |
Superconducting materials for the energy sector Superledende materialer til energisektoren Vindenergi Wind energy
Accommodation field Astronomy Extraterrestrial measurements Laboratories Magnetic field measurement Magnetic hysteresis Magnetization Physics SrTiO<sub>3</sub> Superconducting films Transistors YBCO thin films YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7</sub> Yttrium barium copper oxide accommodation field barium compounds characteristic field collective pinning critical current density critical current density (superconductivity) flux fronts flux pinning high-temperature superconductors magnetisation magnetization curves matching field single vortex pinning superconducting films superconducting thin films transport measurements yttrium compounds
