The European Physical Journal B

ISSN: 1434-6028 (printed version)
ISSN: 1434-6036 (electronic version)

Table of Contents

Abstract Volume 5 Issue 3 (1998) pp 361-365

Moment-volume instabilities in $\mathsf{Ti_xFe_{100-x}}$ alloys with compositions around the C14 laves phase $\mathsf{TiFe_2}$

E.F. Wassermann, B. Rellinghaus, T. Roessel, J. Kästner (a), W. Pepperhoff

Tieftemperaturphysik, Universität Duisburg, 47048 Duisburg, Germany

Received: 26 January 1998 / Accepted: 17 April 1998

Abstract: We measured the thermal expansion and the specific heat of Ti_xFe_100-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.

PACS. 75.25.+z Spin arrangements in magnetically ordered materials - 75.30.Kz Magnetic phase boundaries - 75.10.Lp Band and itinerant models

(a) email: kaestner@ttphysik.uni-duisbourg.de

Article in PDF format (284 KB)

Online publication: October 26, 1998
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