Pressure effect on the competition between ferromagnetic and antiferromagnetic spin fluctuations in TmTe investigated by 125Te-NMR
Identifieur interne : 001656 ( Main/Merge ); précédent : 001655; suivant : 001657Pressure 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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- Pascal (Inist)
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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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Te-NMR</title>
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<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>
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<author><name sortKey="Wada, S" sort="Wada, S" uniqKey="Wada S" first="S." last="Wada">S. Wada</name>
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<series><title level="j" type="main">Journal of magnetism and magnetic materials</title>
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<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>
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<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>
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<affiliations><list><country><li>Japon</li>
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<region><li>Région de Tōhoku</li>
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