Abstract
We report results of specific heat measurements from 5 to 70 K on thin films of the giant negative magnetoresistive spin glass - and its nonmagnetic analog - . The specific heat of - samples is significantly greater than that of - samples below 50 K. The resulting magnetic entropy of - exceeds the total calculated entropy available from Gd moments alone. We suggest that the additional entropy is provided by the interaction of barely localized electron spins with the Gd moments.
- Received 20 January 1999
DOI:https://doi.org/10.1103/PhysRevLett.83.2266
©1999 American Physical Society