Moment-volume instabilities in alloys with compositions around the C14 laves phase |
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| Authors: | EF Wassermann B Rellinghaus T Roessel J Kästner W Pepperhoff |
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| Institution: | Tieftemperaturphysik, Universit?t Duisburg, 47048 Duisburg, Germany, DE
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| Abstract: | We measured the thermal expansion and the specific heat of TixFe100-x alloys with x
= 30.5, 32.5 and 35, all with hexagonal C14 laves phase structure (MgZn2) like TiFe2, and determine the temperature dependence of the magnetic contributions to the thermal expansion and the specific heat cmag. For fixed composition and c
mag
(
T
) show the same type of behavior, demonstrating that both anomalies are of the same microscopic nature. They originate from
moment-volume fluctuations (antiferromagnetic Invar-effect) as a comparison with total energy calculations as a function of
atomic volume and moment for TiFe2 reveals.
Received: 26 January 1998 / Accepted: 17 April 1998 |
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| Keywords: | PACS 75 25 +z Spin arrangements in magnetically ordered materials - 75 30 Kz Magnetic phase boundaries - 75 10 Lp Band and itinerant models |
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