Incommensurate Structure and Stress-Induced Phase in {N(CD_3)_4}_2ZnCl_4

概要

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Magnetic interaction between two 7J orbitals in D,.. symmetry is discussedusing an effective Hamiltonian set up mainly from symmetry consideration. Theresonance effect between orbital structures n..x5 and x. "Z>+ is found mostimportant in determining the ground state ('I;) of the system. The obtainedenergy levels give a good description of the ground and lower excited states ofthe 0. molecule, so that the magnetism of O. can be explained by the valencebond theory only with correct care of the orbita.l valence. It is also shown thatthe same resonance effect makes "I" state of the n-n' system (e.g., CO molecule)most stable. The effective Ha.miltonian for a p-p system with D.,. symmetry isderived in a similar way. With t.-p isomorphism, the results reduce to the res-tricted form given recently by Drillon and Georges when several relations areassumed to hold amont the oarameters.
社団法人日本物理学会の論文
1981-05-15