Pressure effect on the competition between ferromagnetic and antiferromagnetic spin fluctuations in TmTe investigated by 125Te-NMR
Identifieur interne : 001608 ( Main/Exploration ); précédent : 001607; suivant : 001609Pressure effect on the competition between ferromagnetic and antiferromagnetic spin fluctuations in TmTe investigated by 125Te-NMR
Auteurs : A. Yamamoto [Japon] ; S. Wada [Japon] ; T. Matsumura [Japon]Source :
- Journal of magnetism and magnetic materials [ 0304-8853 ] ; 2007.
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Abstract
To elucidate from a microscopic point of view the initial evolution of spin fluctuations in TmTe from the semiconducting state at ambient pressure with an antiferroquadrupole ordering (TQ = 1.8K) to the intermediate-valence metallic state at high pressures P≥2 GPa with a ferromagnetic (FM) ordering (Tc ≃ 14 K), we have carried out 125Te-NMR study at pressures P = 0 and 0.9 GPa. The spin-lattice relaxation rate measurements revealed a pronounced increase of the staggered susceptibility below T≃ 14 K, in addition to the Curie-Weiss-type increase of the uniform susceptibility. Below ∼T*, a wipe-out decrease of the NMR intensity and the finding of an unconventional NMR signal around ∼ 10 MHz that is insensitive to applied field lead to the conclusion that a field-induced short-range FM ordering caused by the competition of FM and antiferromagnetic fluctuations takes place. Pressure of 0.9 GPa hardly affects the anomalous NMR behaviors below ∼T*, leading to speculate that the short-range FM ordering in the semiconducting state shares the origin with the long-range FM ordering at≃ 14K in the high-pressure metallic state.
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Wada</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Department of Material Science, Graduate School of Science and Technology, Kobe University</s1><s2>Nada, Kobe 657-8501</s2><s3>JPN</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ></inist:fA14><country>Japon</country><wicri:noRegion>Nada, Kobe 657-8501</wicri:noRegion></affiliation></author><author><name sortKey="Matsumura, T" sort="Matsumura, T" uniqKey="Matsumura T" first="T." last="Matsumura">T. Matsumura</name><affiliation wicri:level="4"><inist:fA14 i1="02"><s1>Department of Physics, Graduate School of Science, Tohoku University</s1><s2>Sendai 980-8578</s2><s3>JPN</s3><sZ>3 aut.</sZ></inist:fA14><country>Japon</country><placeName><settlement type="city">Sendai</settlement><region type="province">Région de Tōhoku</region></placeName><orgName type="university">Université du Tōhoku</orgName></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">INIST</idno><idno type="inist">07-0194304</idno><date when="2007">2007</date><idno type="stanalyst">PASCAL 07-0194304 INIST</idno><idno type="RBID">Pascal:07-0194304</idno><idno type="wicri:Area/Pascal/Corpus">000786</idno><idno type="wicri:Area/Pascal/Curation">000786</idno><idno type="wicri:Area/Pascal/Checkpoint">000746</idno><idno type="wicri:explorRef" wicri:stream="Pascal" wicri:step="Checkpoint">000746</idno><idno type="wicri:doubleKey">0304-8853:2007:Yamamoto A:pressure:effect:on</idno><idno type="wicri:Area/Main/Merge">001656</idno><idno type="wicri:Area/Main/Curation">001608</idno><idno type="wicri:Area/Main/Exploration">001608</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a">Pressure effect on the competition between ferromagnetic and antiferromagnetic spin fluctuations in TmTe investigated by <sup>125</sup>Te-NMR</title><author><name sortKey="Yamamoto, A" sort="Yamamoto, A" uniqKey="Yamamoto A" first="A." last="Yamamoto">A. Yamamoto</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Department of Material Science, Graduate School of Science and Technology, Kobe University</s1><s2>Nada, Kobe 657-8501</s2><s3>JPN</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ></inist:fA14><country>Japon</country><wicri:noRegion>Nada, Kobe 657-8501</wicri:noRegion></affiliation></author><author><name sortKey="Wada, S" sort="Wada, S" uniqKey="Wada S" first="S." last="Wada">S. Wada</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Department of Material Science, Graduate School of Science and Technology, Kobe University</s1><s2>Nada, Kobe 657-8501</s2><s3>JPN</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ></inist:fA14><country>Japon</country><wicri:noRegion>Nada, Kobe 657-8501</wicri:noRegion></affiliation></author><author><name sortKey="Matsumura, T" sort="Matsumura, T" uniqKey="Matsumura T" first="T." last="Matsumura">T. Matsumura</name><affiliation wicri:level="4"><inist:fA14 i1="02"><s1>Department of Physics, Graduate School of Science, Tohoku University</s1><s2>Sendai 980-8578</s2><s3>JPN</s3><sZ>3 aut.</sZ></inist:fA14><country>Japon</country><placeName><settlement type="city">Sendai</settlement><region type="province">Région de Tōhoku</region></placeName><orgName type="university">Université du Tōhoku</orgName></affiliation></author></analytic><series><title level="j" type="main">Journal of magnetism and magnetic materials</title><title level="j" type="abbreviated">J. magn. magn. mater.</title><idno type="ISSN">0304-8853</idno><imprint><date when="2007">2007</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Journal of magnetism and magnetic materials</title><title level="j" type="abbreviated">J. magn. magn. mater.</title><idno type="ISSN">0304-8853</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Curie-Weiss law</term><term>Ferromagnetic materials</term><term>Ferromagnetism</term><term>High pressure</term><term>Intermediate valence</term><term>Magnetic semiconductors</term><term>Nuclear magnetic resonance</term><term>Ordering</term><term>Pressure effects</term><term>Spin fluctuations</term><term>Spin-lattice relaxation</term><term>Thulium tellurides</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Effet pression</term><term>Fluctuation spin</term><term>Résonance magnétique nucléaire</term><term>Relation ordre</term><term>Valence intermédiaire</term><term>Haute pression</term><term>Ferromagnétisme</term><term>Relaxation spin réseau</term><term>Loi Curie Weiss</term><term>Matériau ferromagnétique</term><term>Thulium tellurure</term><term>Semiconducteur magnétique</term><term>TmTe</term><term>7550P</term><term>7660</term><term>7530M</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">To elucidate from a microscopic point of view the initial evolution of spin fluctuations in TmTe from the semiconducting state at ambient pressure with an antiferroquadrupole ordering (T<sub>Q</sub> = 1.8K) to the intermediate-valence metallic state at high pressures P≥2 GPa with a ferromagnetic (FM) ordering (T<sub>c</sub> ≃ 14 K), we have carried out <sup>125</sup>Te-NMR study at pressures P = 0 and 0.9 GPa. The spin-lattice relaxation rate measurements revealed a pronounced increase of the staggered susceptibility below T≃ 14 K, in addition to the Curie-Weiss-type increase of the uniform susceptibility. Below ∼T<sup>*</sup>, a wipe-out decrease of the NMR intensity and the finding of an unconventional NMR signal around ∼ 10 MHz that is insensitive to applied field lead to the conclusion that a field-induced short-range FM ordering caused by the competition of FM and antiferromagnetic fluctuations takes place. Pressure of 0.9 GPa hardly affects the anomalous NMR behaviors below <sup>∼</sup>T<sup>*</sup>, leading to speculate that the short-range FM ordering in the semiconducting state shares the origin with the long-range FM ordering at≃ 14K in the high-pressure metallic state.</div></front></TEI><affiliations><list><country><li>Japon</li></country><region><li>Région de Tōhoku</li></region><settlement><li>Sendai</li></settlement><orgName><li>Université du Tōhoku</li></orgName></list><tree><country name="Japon"><noRegion><name sortKey="Yamamoto, A" sort="Yamamoto, A" uniqKey="Yamamoto A" first="A." last="Yamamoto">A. Yamamoto</name></noRegion><name sortKey="Matsumura, T" sort="Matsumura, T" uniqKey="Matsumura T" first="T." last="Matsumura">T. Matsumura</name><name sortKey="Wada, S" sort="Wada, S" uniqKey="Wada S" first="S." last="Wada">S. Wada</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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