Determination of solid solubility level of Ho nanoparticles in Y-123 superconducting matrix and strong Cu1 site preference of nanoparticles

The excess Ho particles inserted in the Y-123 superconducting matrix not only damage the crystal plane alignments and crystallinity of poly-crystallized Y-123 bulk samples but also lead to the phase transition from optimally doped state to the underdoped position in the crystal structure.