Moment-volume instabilities in TixFe100-x alloys with compositions around the C14 laves phase TiFe2

E. F. Wassermann; B. Rellinghaus; Th. Roessel; J. Kästner; W. Pepperhoff

doi:10.1007/s100510050454

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Condensed Matter and Complex Systems

Eur. Phys. J. B 5, 361-365 (1998)
https://doi.org/10.1007/s100510050454

Moment-volume instabilities in Ti_xFe_100-x alloys with compositions around the C14 laves phase TiFe₂ ^*

E. F. Wassermann, B. Rellinghaus, Th. Roessel, J. Kästner^a and W. Pepperhoff

Tieftemperaturphysik, Universität Duisburg, 47048 Duisburg, Germany

Corresponding author: ^a kaestner@ttphysik.uni-duisbourg.de

Received: 26 January 1998
Accepted: 17 April 1998
Published online: 15 October 1998

Abstract

We measured the thermal expansion and the specific heat of Ti_xFe100-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 $\alpha_{mag}$ and the specific heat c_mag. For fixed composition $\alpha_{mag}(T)$ 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.