Effects of Zn impurities on the vortex phase diagram of YBa2 (Cu1-xZnx)3 Oy single crystals with O ≤ × ≤ 0.064 have been investigated in magnetic field up to 18 T. The first-order vortex lattice melting transition and the fielddriven disordering transition are extremely suppressed by small amount of Zn impurities. As for Zn-doped YBCO with x ≥ 0.001, the resistive transition shows a broad temperature dependence due to the second-order vortex glass melting transition, while the field-driven disordering transition survives up to 0.003. These behaviors suggest that disorderes induced by Zn impurities strongly affect the vortex system in comparison with the oxygen deficiency in YBCO.
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
- Materials Science(all)
- Condensed Matter Physics