NMR Study of ^<93>Nb in Layered Superconducting 2H-NbSe_2
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概要
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The nuclear spin-lattice relaxation times T_1's and the Knight shift of ^<93>Nb in 2H-NbSe_2 in a single crystal and powdered samples have been measured at 10 MHz and at low temperatures. The Knight shift contains both isotropic and anisotropic terms. The isotropic Knight shift, K_<lso>=-0.03(%), is decomposed into the core-polarization part, K_d=-0.66(%), and the orbital part, K_<orb>=+0.63(%). In normal state, T_1 obeys a relation, T_1T=65±10 msecK and shows no strong anisotropy. The dependence of T_1 on the symmetry properties of the conduction wave functions is discussed. It is concluded that the admixture of d_<3z^2-r^2> orbit dominates at the Fermi level and T_1 of ^<93>Nb is dominated by the core-polarization interaction. In the superconducting state T_1 varies exponentially as in the case of bulk BCS superconductor with energy gap of 3.5 k_BT_C.
- 社団法人日本物理学会の論文
- 1976-05-15
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