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Effect of a magnetic field on the magnetostructural phase transition in Gd5(SixGe1-x)4

MPG-Autoren
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de Brion,  S.
High Magnetic Field Laboratory, Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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Zitation

Casanova, F., Labarta, A., Batlle, X., Marcos, J., Mañosa, L., Planes, A., et al. (2004). Effect of a magnetic field on the magnetostructural phase transition in Gd5(SixGe1-x)4. Physical Review B, 69(10): 104416.


Zitierlink: https://hdl.handle.net/21.11116/0000-000E-FF1B-6
Zusammenfassung
The first-order magnetostructural phase transition in Gd-5(SixGe1-x)(4)
alloys with xless than or equal to0.5 and the related entropy change
DeltaS are analyzed from high-field magnetization curves up to 23 T,
and differential scanning calorimetry up to 5 T. The variation of the
transition field H-t with the transition temperature T-t is discussed
for fields up to 23 T for the xless than or equal to0.5 range. From
these data, the ratio dH(t)/dT(t), which is related to the strength of
the magnetoelastic coupling, is obtained as a function of x. We show
that DeltaS obtained from the Clausius-Clapyeron equation and the
Maxwell relation are equivalent for all compositions (0less than or
equal toxless than or equal to0.5), provided the Maxwell relation is
evaluated only within the transition region. The T and H dependences of
DeltaS are accounted for by modeling the T and H dependences of the
magnetization outside the transition.