Magnetovolume anomalies in Ce₂Fe₁₇₋xMnx

• Published in: Физика низких температур
• Date: 2001
• Main Authors: Prokhnenko, O., Arnold, Z., Kamarad, J., Medvedeva, I., Kuchin, A.
• Format: Article
• Language: English
• Published: Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України 2001
• Subjects: Низкотемпеpатуpная магнитостpикция магнетиков и свеpхпpоводников
• Online Access: https://nasplib.isofts.kiev.ua/handle/123456789/130013
• Journal Title: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Cite this: Magnetovolume anomalies in Ce₂Fe₁₇₋xMnx / O. Prokhnenko , Z. Arnold, J. Kamarad, I. Medvedeva , A. Kuchin // Физика низких температур. — 2001. — Т. 27, № 4. — С. 375-378. — Бібліогр.: 8 назв. — англ.

The small nonmonotonic changes of the lattice parameters upon the substitution of Mn for Fe in Ce₂Fe₁₇ lead to significant changes of the magnetic properties. In order to determine the role of the volume, we made ac susceptibility and thermal expansion measurements on the polycrystalline compounds Ce₂Fe₁₆.₆₅Mn₀.₃₅ and Ce₂Fe₁₆Mn₁ under hydrostatic pressure up to 10 kbar in the temperature range 10-300 K. The substitution of Mn for Fe leads to significant narrowing of the range of stability of the low-temperature ferromagnetic phase characterized by ΘT =48 K (x=0.35) in comparison with binary Ce₂Fe₁₇, where ΘT =94 K. Applying a relatively small pressure of 1.5 kbar leads to suppression of both the ferromagnetic order and large positive spontaneous volume magnetostriction in Ce₂Fe₁₆.₅Mn₀.₃₅. The pressure effect on ΘT is significant, d ΘT / dp=-30 K/kbar. The effect of pressure on the Néel temperature is moderate and slightly increases with increasing Mn content (dTN / dp= -2.2 K/kbar for Ce₂Fe₁₆.₆₅Mn₀.₃₅). No ferromagnetic order was observed in Ce₂Fe₁₆Mn₁ at ambient pressure, but an unexpected reentering increase of the ac susceptibility was detected at pressures higher than 1.5 kbar below 50 K. It indicates the existence of a pressure-induced ferromagnetic phase at low temperature. The results show not only a strong correlation between the magnetic properties and the lattice volume but also a significant role of the Mn content. 
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