✦ LIBER ✦

Anomaly in the low temperature thermal expansion of alloys near the critical composition for magnetism

✍ Scribed by A.B. Kaiser; T.F. Smith

Publisher: Elsevier Science
Year: 1990
Tongue: English
Weight: 268 KB
Volume: 161
Category: Article
ISSN: 0921-4526
DOI: 10.1016/0921-4526(89)90097-5

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✦ Synopsis

The thermal expansion of Ni-Cr alloys, near the critical concentration xy at which ferromagnetic order appears, shows a small characteristic anomaly below about 10 K. This anomaly increases in size as X, is approached, then abruptly changes sign going through x,. We deduce from the expansion data that the ground-state magnetovolume in the ferromagnetic Ni-Cr alloys is positive, and suggest a qualitative picture that accounts for the sign change of the anomaly. Our explanation provides support for the notion that spin fluctuations significantly affect volume.

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