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NMR study of one-dimensional ionic conductor with hollandite-type structure. II. Frequency dependence of spin-lattice relaxation time of 27Al
Authors:Y. Onoda  Y. Fujiki  M. Takigawa  H. Yasuoka  S. Yoshikado  T. Ohachi  I. Taniguchi
Affiliation:National Institute for Research in Inorganic Materials, 1-1, Namiki, Sakura-mura, Niihari-gun, Ibaraki 305, Japan;The Institute for Solid State Physics, The University of Tokyo, Minato-ku, Tokyo 106, Japan;Department of Electronics, Doshisha University, Kyoto 602, Japan
Abstract:Frequency dependence of spin-lattice relaxation time T1 of 27Al in one-dimensional K+ ion conductor, K-Al-priderite, was measured at 45 K in the frequency range from 10.1 MHz to 55 MHz. It is found that T1 is proportional to ω1.49±0.05 and agrres well with the ω34 dependence derived by the continuum diffusion model. The intrinsic activation energy is determined to be 0.058 eV by doubling the slope ENMR=0.029 eV of the d(ln T1)/dT curve in the low temperature region. The frequency dependence of T1 in the high temperature region measured in the frequency range from 11.5 MHz to 20.8 MHz shows a tendency that the frequency dependence becomes smaller than the ω12 dependence as temperature is raised above 450 K.
Keywords:Author to whom correspondence should be addressed.
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