Nuclear Spin-Lattice Relaxation in the Linear Chain Metal,NbSe3 |
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| Authors: | S Wada R Aoki O Fujita |
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| Institution: | 1. College of Liberal Arts , Kobe University , Nada, Kobe, 657, Japan;2. Department of Physics , Kyushu University 33 , Fukuoka, 812, Japan;3. College of Liberal Arts , Kobe University , Nada, Kobe, 657, Japan |
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| Abstract: | Abstract The nuclear spin-lattice relaxation time T 1 of 93Nb in NbSe3 has been observed as a function of frequency v N in the range 6-40 MHz at 4.2 K and of temperature T in the range 1.3-77 K at 10 MHz. T 1 T]?1 is found to be proportional to 1/√ν corresponding to characteristic divergence of spin correlation function in 1-D system. Below ~10 MHz, a break down of the divergence is observed. The important features of the T dependence observed are a sharp minimum at ~45 K and an asymptotical approach to the metallic relation, T 1 T= const, with decreasing T down to helium temperature. This T 1 T]?1 minimum is explained by the destruction of the Fermi surface due to the CDW gap formation. The re-increase of T 1 T]?1 below the CDW transition may suggest a partial recovery of the destructed Fermi surface. |
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| Keywords: | even-odd effect volume change entropy change order parameter N/SmA transition |
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