Abstract
We have measured the specific heat of sintered YBa2Cu3O6.70 powder between 1.85 and 77 K in zero magnetic field, and between 1.75 and 9.5 K in applied fields up to 3 T. The sample was characterized by x-ray diffraction, scanning electron microscopy, iodometric titration, and magnetic susceptibility. The onset of the diamagnetic transition to the superconducting state occurred at Tc=67 K. For the specific heat in nonzero applied magnetic field, there is an increase in the magnitude of the term that is linear in temperature, and a decrease in the term that is cubic in temperature. These results agree with earlier results on the Tc=90 K phase of YBa2Cu3O7-. The data for nonzero applied fields were analyzed by using Ginzburg-Landau theory in the London limit for a uniaxially symmetric superconductor.
Original language | English (US) |
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Pages (from-to) | 13073-13079 |
Number of pages | 7 |
Journal | Physical Review B |
Volume | 43 |
Issue number | 16 |
DOIs | |
State | Published - 1991 |
ASJC Scopus subject areas
- Condensed Matter Physics