Dissipation in Non-Kramers Doublet of PrMg3
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概要
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The low-temperature ultrasonic dispersion in the transverse (C_{11}-C_{12})/2 mode of PrMg3 with the non-Kramers-doublet ground state has been investigated in temperatures down to 20 mK. The dispersion is caused by a thermally activated motions characterized by an Arrhenius-type relaxation time of \tau=\tau_{0}\exp(E/k_{\text{B}}T) with low activation energy, E = 500 mK, and slow attempt time, \tau_{0}=8.5\times 10^{-10} s. The coupling of the electric quadrupoles of the non-Kramers-doublet ground state to transverse lattice vibrations leads to a vibronic ground state with dissipation. The vibronic state in PrMg3 releases the entropy of k_{\text{B}}\ln 2 with lowering temperature across the activation energy. A Kondo-like singlet state due to the binding of the non-Kramers doublet to the lattice vibrations appears at low temperatures far below the activation energy.
- 2012-02-15
著者
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Takagi Shigeru
Physics Department Graduate School Of Science Tohoku University
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Goto Terutaka
Graduate School Of Science And Technology Niigata University
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Nemoto Yuichi
Graduate School Of Science And Technology Niigata University
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Suzuki Hiroyuki
National Institute For Material Science
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Akatsu Mitsuhiro
Graduate School Of Science And Technology Niigata University
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Araki Koji
Graduate School of Science and Technology, Niigata University, Niigata 950-2181, Japan
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MITSUMOTO Keisuke
Graduate School of Science and Technology, Niigata University, Niigata 950-2181, Japan
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Tanida Hiroshi
Graduate School of Advanced Sciences of Matter, Hiroshima University, Higashihiroshima, Hiroshima 739-8530, Japan
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Yasin Shadi
Dresden High Magnetic Field Laboratory, Helmholtz-Zentrum Dresden-Rossendorf, 01314 Dresden, Germany
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Zherlitsyn Sergei
Dresden High Magnetic Field Laboratory, Helmholtz-Zentrum Dresden-Rossendorf, 01314 Dresden, Germany
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Wosnitza Joachim
Dresden High Magnetic Field Laboratory, Helmholtz-Zentrum Dresden-Rossendorf, 01314 Dresden, Germany
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Akatsu Mitsuhiro
Graduate School of Science and Technology, Niigata University, Niigata 950-2181, Japan
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Goto Terutaka
Graduate School of Science and Technology, Niigata University, Niigata 950-2181, Japan
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Nemoto Yuichi
Graduate School of Science and Technology, Niigata University, Niigata 950-2181, Japan
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