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APS » Journals » Phys. Rev. Lett. » Volume 83 » Issue 11
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Phys. Rev. Lett. 83, 2266–2269 (1999)

Large Magnetic Entropy in Giant Magnetoresistive Amorphous Gadolinium Silicon

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B. L. Zink, E. Janod*, K. Allen, and F. Hellman
Department of Physics, University of California-San Diego, La Jolla, California 92093

Received 20 January 1999; published in the issue dated 13 September 1999

We report results of specific heat measurements from 5 to 70 K on thin films of the giant negative magnetoresistive spin glass a- GdxSi1-x and its nonmagnetic analog a- YxSi1-x. The specific heat of a- GdxSi1-x samples is significantly greater than that of a- YxSi1-x samples below 50 K. The resulting magnetic entropy of a- GdxSi1-x 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.

© 1999 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.83.2266
DOI:
10.1103/PhysRevLett.83.2266
PACS:
75.40.-s, 71.27.+a, 75.50.-y

*Current Address: CNRS, Institut des Matériaux des Nantes, Nantes, France.

 
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