Abstract
We have measured the specific heat of a superconducting polycrystalline sample of at temperatures from 1.7 to 91 K. The low-temperature data can be fit best by a cubic term β=0.234 mJ/mol (Debye temperature =346 K) and a linear term γT. We find that γ may be zero; it has an upper bound of 0.30 mJ/mol , an order of magnitude smaller than the value found previously for . This result supports the view that has the properties of a BCS-like superconductor.
- Received 25 July 1989
DOI:https://doi.org/10.1103/PhysRevB.40.10878
©1989 American Physical Society