Nuclear Magnetic Relaxation in Ti-V Alloys
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概要
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We have studied the composition dependence of the nuclear magnetic relaxation time T_1 of V^<51> in Ti-V Alloys. The alloy ingots were prepared by melting the metals in an electron beam furnace. The ingots were ground into powders finer than 300 mesh. Free induction decay and spin echo signals of V^<51> nuclei were observed. They had a decay shape of exp {-(t/T_2)^2}. The induction decay time T_2 was practically equal in the alloys having different compositions. The square of the phase memory time T_2 was inversely proportional to the concentration of V, as is expected. The spin-lattice relaxation time T_1 was measured by observing the recovery of the height of a free induction decay signal after a 90 degree pulse is applied. The result is shown in the figure Fig. 1. In the same figure we have also shown the results in V-Cr alloys obtained by Butterworth. Our results fit his for pure V. Measurements of T_1T at liquid air and liquid hydrogen temperatures gave the same results. In the (T_1T)^<-1> vs. alloy composition curve we observe a broad maximum. The curve is qualitatively similar to that of the electronic specific heat, although the square of the latter is steeper than the former. This implies that there is some other ccntribution to (T_1T)^<-1> which is independent of the observed electronic specific heat. Recently, Yafet-Jaccarino and Obata reported a theory of T_1 in transition metals. According to them, there are four contributions to T_1. One of them is the contribution from the Fermi contact interaction with s-electrons. This should be independent of the observed electronic specific heat, because the density of state of s-electrons is far smaller than that of d-electrons. The remaining three contributions, core polarization, orbital and dipolar contributions are all proportional to the density of state of d-electrons. These should vary with the observed electronic specific heat.
- 社団法人日本物理学会の論文
- 1964-07-05
著者
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Fujita Tetsuo
Department Of Physics Nagoya University
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Kume Kiyoshi
The Institute For Solid State Physics The University Of Tokyo
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Fujita Tetsuo
Department Of Electronic Engineering Shizuoka Institute Of Science And Technology
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Fujita Tetsuo
Department of Applied Chemistry, Faculty of Engineering, Osaka University
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