13:00 〜 13:15
▲ [23p-E203-1] Pinning of quantized vortices in GdBCO thin films by BaHfO3 and CaHfO3 nanoinclusions: a comparative study
キーワード：GdBCO thin films, Critical currents, Vortex pinning
GdBa2Cu3O7-d (GdBCO) thin films with various artificial pinning centers (APCs) have been studied recently for many applications due to their large critical current density (Jc) over wide range of temperature and applied magnetic field [1]. Some of the secondary phases, when incorporated into GdBCO film matrix, form nanorods within the superconducting film matrix. These materials include Ba based perovskite materials such as BaZrO3, BaHfO3, BaSnO3. The diameter of the nanorods of these Ba based perovskite materials have been reported to be in the range of ~ 6-10 nm which is much higher than the coherence length (ξab) of GdBCO superconductor at lower temperatures and that is why thinner nanorods are desired to be incorporated inside GdBCO film matrix.
Recently, considerable interest has been developed in incorporating thinner nanorods inside GdBCO films by selecting suitable APC materials or by varying the depositions conditions. In one of the earlier report, it has been predicted that some materials such as (Sr/Ca)HfO3 would form nanorods with much smaller diameter compared to their Ba based counterparts due to the decay of the strain generated at the interface of superconducting GdBCO and insulating APCs [2]. We have investigated the incorporation of BaHfO3 and CaHfO3 nanoinclusions in GdBCO superconducting films and subsequently the vortex pinning properties of the nanocomposite films. In this presentation, the comparison will be drawn between GdBCO films with BaHfO3 and CaHfO3 nanostructures.
References:
[1] Alok K. Jha and Kaname Matsumoto, Front. Phys. 7, 82 (2019).
[2] J. Wu and J. Shi, Supercond. Sci. Technol. 30, 103002 (2017).
Recently, considerable interest has been developed in incorporating thinner nanorods inside GdBCO films by selecting suitable APC materials or by varying the depositions conditions. In one of the earlier report, it has been predicted that some materials such as (Sr/Ca)HfO3 would form nanorods with much smaller diameter compared to their Ba based counterparts due to the decay of the strain generated at the interface of superconducting GdBCO and insulating APCs [2]. We have investigated the incorporation of BaHfO3 and CaHfO3 nanoinclusions in GdBCO superconducting films and subsequently the vortex pinning properties of the nanocomposite films. In this presentation, the comparison will be drawn between GdBCO films with BaHfO3 and CaHfO3 nanostructures.
References:
[1] Alok K. Jha and Kaname Matsumoto, Front. Phys. 7, 82 (2019).
[2] J. Wu and J. Shi, Supercond. Sci. Technol. 30, 103002 (2017).