Vortex phase diagram as a function of oxygen deficiency in untwinned YBa{sub 2}Cu{sub 3}O{sub y}
Magnetization and resistivity measurements were performed in untwinned YBa{sub 2}Cu{sub 3}O{sub y} (YBCO) single crystals with different oxygen content. The authors find that the vortex phase diagram is a strong function of the oxygen deficiency: (1) For fully oxidized YBCO (y {approx{underscore}equal} 7, {Tc} {approx{underscore}equal} 87.5 K), the first-order vortex lattice melting line T{sub m}(H) is observed up to 30 T. (2) For slightly overdoped YBCO ({Tc} {approx{underscore}equal} 92 K), T{sub m}(H) and the vortex glass transition line T{sub g}(H) terminate at the multicritical point and the field-driven disordering transition line separates the vortex solid phase into the Bragg glass and the vortex glass phases. (3) For slightly underdoped YBCO ({Tc} {approx{underscore}equal} 92.3 K), T{sub g}(H) terminates well below the critical point of T{sub m}(H), indicating the existence of the vortex slush regime by the introduced oxygen deficiency.
- Research Organization:
- Tohoku Univ., Sendai (JP)
- OSTI ID:
- 20015322
- Journal Information:
- Journal of Low Temperature Physics, Journal Name: Journal of Low Temperature Physics Journal Issue: 5-6 Vol. 117; ISSN JLTPAC; ISSN 0022-2291
- Country of Publication:
- United States
- Language:
- English
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