75As, 113,115In, and 123Sb NMR Studies of Indirect Nuclear Spin–Spin Coupling in In$X$ ($X=\text{As}$, Sb)

概要

論文の詳細を見る
Indirect nuclear spin–spin coupling in In$X$ ($X=\text{As}$, Sb) semiconductors has been investigated by magic-angle spinning (MAS) NMR for 75As, 113,115In and 123Sb spins. The coupling constants, $J$, of the isotropic indirect interaction for neighboring 113,115In–$X$ ($X=\text{$^{75}$As}$, 123Sb) spins were obtained as $478\pm 10$ and $730\pm 40$ Hz, respectively, from triple-resonance NMR experiments employing cross polarization from rare 113In to $X$ and 115In decoupling during acquisition. The $J$ values above and those for the 113,115In–121Sb spins were also estimated by a second moment analysis for the MAS NMR spectra of 75As, 113,115In and 123Sb spins, but the moment analysis provided values that deviated from the correct ones by a factor of up to 1.7. The reduced indirect coupling constant $K$ was calculated from the above $J$ values for In$X$ ($X=\text{As}$, Sb) and the previously obtained value of $J=224\pm 5$ Hz for InP [T. Iijima et al.: J. Phys. Soc. Jpn. 73 (2004) 1045]. The increase in $K$ with decreasing band gap energy of the semiconductors of In$X$ ($X=\text{P}$, As, Sb) was explained by considering that indirect coupling is dominated by the second-order perturbation energy of the nuclear–electron interaction with occupied and unoccupied states being in the valence and conduction bands, respectively.
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2006-02-15