Effective Conversion of CDW Sites to SDW States in Pd-Ni Mixed-Metal MX Chains

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概要

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• We theoretic;rlly study the interplay between 21 charge-density-wave (CDW) and spin-density-wave (SOW) in tnixed-rnetal IVIX chains. We asstume that two kinds of tnetals, narnely, Pd and Ni,are randonuly distribtrted in a one-dinaensional chain. Since all-Pd and all-Xi compounds showCDW and SDW, respectively, tlae gradtral rauixing of strch a type gives a very good viewpoint forunderstanditag both the states IIIOUO deeply. Using a Peierls-Htrbbard unodel arrd a mean-fieldapproxitaaation, we find that the CDW state is dr;rstic?rIly sujcpressed by the replacernent of' Pdsites with Ni ones. As a restrlt, the Ni concentration of' 50% is enough to destroy the CDWcornpletely if tlae Htrbbard-G at Ni sites is large enotrgh as expected in rearl materials. Thistaaeans that all the Pd sites become Pd" with no halogen displacements and, 218 a whole, amodified SDW state is formed. Such a pecttli?tr state, which does not exist in pttre MX chains,can explaiua the restrlts of BSR and Ranuan experiraaents.

• 社団法人日本物理学会の論文
• 1999-03-15

著者

• IWANO Kaoru

  Institute for Molecular Science

• Iwano Kaoru

  Institute Of Materials Sturucture Science High Energy Accelerator Research Organization Graduate Uni

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