Spin Dynamics at Very Low Temperature in Spin Ice Dy2Ti2O7
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概要
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We have performed AC susceptibility and DC magnetic relaxation measurements on the spin ice system Dy2Ti2O7 down to 0.08 K. The relaxation time of the magnetization has been estimated below 2 K down to 0.08 K. The spin dynamics of Dy2Ti2O7 is well described by using two relaxation times [\tau_{\text{S}} (short time) and \tau_{\text{L}} (long time)]. Both \tau_{\text{S}} and \tau_{\text{L}} increase on cooling. Assuming the Arrhenius law in the temperature range 0.5--1 K, we obtained an energy barrier of 9 K. Below 0.5 K, both \tau_{\text{S}} and \tau_{\text{L}} show a clear deviation from the thermal activated dynamics toward temperature independent relaxation, suggesting a quantum dynamics.
- 2011-12-15
著者
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Sekine Chihiro
Muroran Institute Of Technology
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Hiroi Zenji
Institute For Chemical Research Kyoto University
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Paulsen Carley
Institute Néel C.N.R.S --- Universite Joseph Fourier, BP 166, 38042, Grenoble, France
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Paulsen Carley
Institut Néel, CNRS/UJF Grenoble, 38042 Grenoble, France
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Lhotel Elsa
Institute Néel C.N.R.S --- Universite Joseph Fourier, BP 166, 38042, Grenoble, France
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MATSUHIRA Kazuyuki
Kyushu Institute of Technology, Kitakyushu 804-8550, Japan
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Takagi Seishi
Kyushu Institute of Technology, Kitakyushu 804-8550, Japan
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Matsuhira Kazuyuki
Kyushu Institute of Technology
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