Details

Autor(en) / Beteiligte

• MAUGER, A
• RAVOT, D
• BONVILLE, P
• SOLOKHA, P
• DE NEGRI, S
• PAVLYUK, V
• SACCONE, A
• TEDENAC, J.-C

Titel

Ferromagnetic spin fluctuations in quasi-2D-EuCu9Mg2

Ist Teil von

• Journal of alloys and compounds, 2010-10, Vol.508 (1), p.28-36

Ort / Verlag

Kidlington: Elsevier

Erscheinungsjahr

2010

Link zum Volltext

Quelle

Elsevier ScienceDirect Journals Complete

Beschreibungen/Notizen

• The ternary intermetallic compound EuCu9Mg2 has been synthesized. The magnetic properties have been investigated by magnetization measurements and 151Eu Mössbauer spectroscopy. Europium is divalent and a spin freezing is observed at 25 K. However, this spin freezing is characterized by the onset of strong magnetic irreversibility, which suggests a cluster-glass freezing. The Mössbauer spectra can be analyzed as the superposition of two subspectra of Eu2+ ions, which is consistent with a cluster-glass freezing. A transition to the ferromagnetic state is induced by application of a magnetic field the order of 0.5 T. This anomalous feature is attributed to quantum spin fluctuations that oppose the long-range ferromagnetic ordering, due to the two-dimensional topology of the geometric arrangement of the Eu2+ ions. This 2D-topology is also evidenced by a quadratic variation of the specific heat as a function of temperature down to 2.7 K. The electrical resistivity is also analyzed in the framework of intermetallic compounds dominated by ferromagnetic spin fluctuations above the spin-freezing temperature.