Abstract
We have measured the upper critical field Bc2(T) of Y2-xBaxCuO4-y with x=0.4 near Tc in dc fields up to 20 T and at 77 K with pulsed fields to 45 T. The data yield (dBc2/dT)T=Tc=1.3 T/K and Tc=89.5 K for the midpoint of the resistive transitions, and (dBc2/dT)T=Tc=51 T/K and Tc=95.1 K for the onset. The estimates for Bc2(0) range from 80 to 320 T. Pulsed-field data suggest that a fraction of the material is still superconducting above 45 T at 77 K.
Original language | English (US) |
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Pages (from-to) | 7249-7251 |
Number of pages | 3 |
Journal | Physical Review B |
Volume | 35 |
Issue number | 13 |
DOIs | |
State | Published - 1987 |
Externally published | Yes |
ASJC Scopus subject areas
- Condensed Matter Physics