Magnetic structures in the quadrupolar compound TmAu2
Identifieur interne : 002135 ( Main/Exploration ); précédent : 002134; suivant : 002136Magnetic structures in the quadrupolar compound TmAu2
Auteurs : M. Amara [France] ; P. Morin [France] ; P. Burlet [France] ; P. Lejay [France]Source :
- Journal of physics. Condensed matter : (Print) [ 0953-8984 ] ; 2001.
Descripteurs français
- Pascal (Inist)
- Structure magnétique, Antiferromagnétisme, Diffraction neutron, Diagramme phase magnétique, Interaction échange, Transformation Fourier, Dépendance température, Paramètre ordre, Coexistence, Réseau quadratique, Composé intermétallique, Alliage base or, Thulium alliage, Alliage binaire, Monocristal, Etude expérimentale, Alliage Au70Tm30, Au Tm, 7525.
English descriptors
- KwdEn :
- Antiferromagnetism, Binary alloys, Coexistence, Exchange interactions, Experimental study, Fourier transformation, Gold base alloys, Intermetallic compounds, Magnetic structure, Magnetic-phase diagrams, Monocrystals, Neutron diffraction, Order parameters, Temperature dependence, Tetragonal lattices, Thulium alloys.
Abstract
The occurrence of a quadrupolar ordering within the y orthorhombic symmetry at 7 K in TmAu2 (MoSi2-type tetragonal structure) was recently discovered. The existence of an antiferromagnetic ordering around 3 K in the quadrupolar phase leads to complex magnetic phase diagrams in the (H, T) plane. From neutron diffraction studies on a single crystal, a magnetic structure is determined for each of the five phases observed for a magnetic field applied along the twofold orthorhombic axis. The complexity of the phase diagram can be understood as the result of a conflict, under field, between quadrupoles and antiferromagnetic moments, associated with a rather degenerated maximum for the J(Q) Fourier transform of the exchange couplings. Then classical arrangements perpendicular to the field and Ising-type behaviours are observed; in the latter case, the incommensurate nature of the magnetic interactions leads to behaviours of devil's staircase type.
Affiliations:
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Amara</name><affiliation wicri:level="3"><inist:fA14 i1="01"><s1>Laboratoire Louis-Néel, CNRS, BP 166X</s1><s2>38042 Grenoble</s2><s3>FRA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region" nuts="2">Auvergne-Rhône-Alpes</region><region type="old region" nuts="2">Rhône-Alpes</region><settlement type="city">Grenoble</settlement></placeName></affiliation></author><author><name sortKey="Morin, P" sort="Morin, P" uniqKey="Morin P" first="P." last="Morin">P. 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Burlet</name><affiliation wicri:level="3"><inist:fA14 i1="02"><s1>Magnétisme et Diffraction Neutronique, DRF/MC, Centre d'Etudes Nucléaires BP 85X</s1><s2>38041 Grenoble</s2><s3>FRA</s3><sZ>3 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region" nuts="2">Auvergne-Rhône-Alpes</region><region type="old region" nuts="2">Rhône-Alpes</region><settlement type="city">Grenoble</settlement></placeName></affiliation></author><author><name sortKey="Lejay, P" sort="Lejay, P" uniqKey="Lejay P" first="P." last="Lejay">P. Lejay</name><affiliation wicri:level="3"><inist:fA14 i1="03"><s1>CRTBT CNRS, BP 166X</s1><s2>38042 Grenoble</s2><s3>FRA</s3><sZ>4 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region" nuts="2">Auvergne-Rhône-Alpes</region><region type="old region" nuts="2">Rhône-Alpes</region><settlement type="city">Grenoble</settlement></placeName></affiliation></author></analytic><series><title level="j" type="main">Journal of physics. Condensed matter : (Print)</title><title level="j" type="abbreviated">J. phys., Condens. matter : (Print)</title><idno type="ISSN">0953-8984</idno><imprint><date when="2001">2001</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Journal of physics. Condensed matter : (Print)</title><title level="j" type="abbreviated">J. phys., Condens. matter : (Print)</title><idno type="ISSN">0953-8984</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Antiferromagnetism</term><term>Binary alloys</term><term>Coexistence</term><term>Exchange interactions</term><term>Experimental study</term><term>Fourier transformation</term><term>Gold base alloys</term><term>Intermetallic compounds</term><term>Magnetic structure</term><term>Magnetic-phase diagrams</term><term>Monocrystals</term><term>Neutron diffraction</term><term>Order parameters</term><term>Temperature dependence</term><term>Tetragonal lattices</term><term>Thulium alloys</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Structure magnétique</term><term>Antiferromagnétisme</term><term>Diffraction neutron</term><term>Diagramme phase magnétique</term><term>Interaction échange</term><term>Transformation Fourier</term><term>Dépendance température</term><term>Paramètre ordre</term><term>Coexistence</term><term>Réseau quadratique</term><term>Composé intermétallique</term><term>Alliage base or</term><term>Thulium alliage</term><term>Alliage binaire</term><term>Monocristal</term><term>Etude expérimentale</term><term>Alliage Au70Tm30</term><term>Au Tm</term><term>7525</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The occurrence of a quadrupolar ordering within the y orthorhombic symmetry at 7 K in TmAu<sub>2</sub> (MoSi<sub>2</sub>-type tetragonal structure) was recently discovered. The existence of an antiferromagnetic ordering around 3 K in the quadrupolar phase leads to complex magnetic phase diagrams in the (H, T) plane. From neutron diffraction studies on a single crystal, a magnetic structure is determined for each of the five phases observed for a magnetic field applied along the twofold orthorhombic axis. The complexity of the phase diagram can be understood as the result of a conflict, under field, between quadrupoles and antiferromagnetic moments, associated with a rather degenerated maximum for the J(Q) Fourier transform of the exchange couplings. Then classical arrangements perpendicular to the field and Ising-type behaviours are observed; in the latter case, the incommensurate nature of the magnetic interactions leads to behaviours of devil's staircase type.</div></front></TEI><affiliations><list><country><li>France</li></country><region><li>Auvergne-Rhône-Alpes</li><li>Rhône-Alpes</li></region><settlement><li>Grenoble</li></settlement></list><tree><country name="France"><region name="Auvergne-Rhône-Alpes"><name sortKey="Amara, M" sort="Amara, M" uniqKey="Amara M" first="M." last="Amara">M. Amara</name></region><name sortKey="Burlet, P" sort="Burlet, P" uniqKey="Burlet P" first="P." last="Burlet">P. Burlet</name><name sortKey="Lejay, P" sort="Lejay, P" uniqKey="Lejay P" first="P." last="Lejay">P. Lejay</name><name sortKey="Morin, P" sort="Morin, P" uniqKey="Morin P" first="P." last="Morin">P. Morin</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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