Enhanced flux pinning force and uniquely shaped flux pinning force plots observed in YBa2Cu3O7-x films with BaSnO3 nanoparticles

We demonstrate that the maximum of the bulk pinning force (Fp,max) of YBCO films with BaSnO3 nanoparticles (YBCO+BSO) can be more than twice the value of Fp,max of regular YBCO films of similar thickness at 77 or 65 K. Also, in YBCO+BSO films, the position of the Fp,max is shifted to higher fields occurring at more than 4 T at 77 K, as opposed to typical 1.5-2 T in good-quality YBCO films. Further, we show that a unique, distinguishable dual-peak structure in Fp versus H plots in YBCO+BSO samples can exist, possibly due to the presence of simultaneously operative dual pinning mechanisms