Successive Multipole Orderings in TmTe, Probed by ^<125>Te-NMR(Condensed matter: electronic structure and electrical, magnetic, and optical properties)
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概要
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We report nuclear magnetic resonance (NMR) studies on evolutions of the spin fluctuation character in a divalent semiconductor TmTe with the applications of external magnetic field and pressure. Upon cooling below 〜20K ^<125>Te-resonance shift -ΔH/H in a high-field 〜7T begins to deviate from the Curie-Weiss (CW) type increase at high temperatures, and exhibits a saturation behavior below 〜3-4K. The nuclear spin-lattice relaxation rate T^<-1>_1 changes the temperature dependence from the increasing behavior at high temperatures to a monotonic decrease below 〜35K and to a rapid drop below 〜3-4K, indicating successive freezing of different spin fluctuation modes. These NMR features lead to an interpretation that two distinct transitions take place in high-fields: from the paramagnetic state (state I) to an intermediate state (state II) below 20-35K, and to a low temperature state (state III) below 〜3-4K. The mechanism of the two successive transitions is discussed in terms of a possible octupolar order and an order of field-induced dipole or octupole moments of originally quadrupole moments of Tm^<2+> ions, respectively, with the low-energy splitting of the crystal electric field levels. In a low-field 〜1T, the negative ΔH/H continues the CW type increase down to 〜4K. On the other hand, T^<-1>_1 exhibits a pronounced increase below 〜15K. These results indicate a development of the generalized susceptibility x(q) with the wave vector q≠0 in low-fields, which could largely disturb the ordering in the state II. The application of a finite pressure of 0.9 GPa hardly changes the spin fluctuation character in low-fields, leading to a conjecture that the ferromagnetic order in the pressure-driven metallic state (T_C=14K for 〜2.7 GPa) shares the basic mechanism with the ordering in the state II of the semiconducting state.
- 社団法人日本物理学会の論文
- 2007-01-15
著者
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Matsumura Takeshi
Adsm Hiroshima University
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Wada Shinji
Graduate School Of Sciences Kobe University
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Wada Shinji
Department Of Material Science Graduate School Of Science And Technology Kobe University:department
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Yamamoto Aya
Department Of Material Science Graduate School Of Science And Technology Kobe University
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Yamamoto Aya
Department Of Food Science And Nutrition Doshisha Women's College
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Matsumura Takeshi
Department Of Physics Graduate School Of Science Tohoku University
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Wada Shinji
Department Of Material Science Graduate School Of Science & Technology Kobe University
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Matsumura Takeshi
Department Of Cardiovascular Surgery Shin-tokyo Hospital
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Matsumura Takeshi
Department Of Agrobiology And Bioresources Faculty Of Agriculture Hokkaido University
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