Ferromagnetic spin fluctuations in quasi-2D-EuCu9Mg2

被引：5

作者：

Mauger, A. ^{[1
]}

Ravot, D. ^{[2
]}

Bonville, P. ^{[3
]}

Solokha, P. ^{[4
]}

De Negri, S. ^{[4
]}

Pavlyuk, V. ^{[5
,6
]}

Saccone, A. ^{[4
]}

Tedenac, J. -C. ^{[2
]}

机构：

[1] Univ Paris 06, Inst Mineral & Phys Matiere Condensee, F-75015 Paris, France

[2] Univ Montpellier 2, ICG UMR 5253, PMOF, F-34000 Montpellier, France

[3] CEA, CE Saclay, Serv Phys Etat Condense, F-91191 Gif Sur Yvette, France

[4] Univ Genoa, Dipartimento Chim & Chim Ind, Sez Chim Inorgan & Met, I-16146 Genoa, Italy

[5] Ivan Franko Natl Univ Lviv, Dept Inorgan Chem, UA-79005 Lvov, Ukraine

[6] Jan Dlugosz Univ, Inst Chem & Environm Protect, PL-42200 Czestochowa, Poland

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2010年 / 508卷 / 01期

关键词：

Magnetic properties; Rare-earth compounds; Cluster glass; HEAT; CE; GLASSES; ALLOYS; MODEL; SM; ND;

D O I：

10.1016/j.jallcom.2010.08.059

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The ternary intermetallic compound EuCu9Mg2 has been synthesized. The magnetic properties have been investigated by magnetization measurements and Eu-151 Mossbauer spectroscopy. Europium is divalent and a spin freezing is observed at 25K. However, this spin freezing is characterized by the onset of strong magnetic irreversibility, which suggests a cluster-glass freezing. The Mossbauer 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 0.5T. 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. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：28 / 36

页数：9

共 42 条

[1] Structure and insertion properties of disordered and ordered LN0.5Mn1.5O4 spinels prepared by wet chemistry [J].