Effects of Impurity Pinning on Commensurate Charge-Density-Wave State and Incommensurate-Commensurate Transition
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The one-dimensional charge-density-wave (CDW) state containing impuritiesis studied theoretically, The localized large-amplitude excitation is taken intoaccount to determine the ground state of the commensurate (C)-CDW state atabsolute zero. It is shown that the long-range order of the C-CDW is unstableagainst an arbitrarily weak impurity potential in spite of the existence of thecommensurability energy. Investigations are also made on the impurity effect onthe incommensurate (I)-C transition as well as the temperature dependence of thewave number of the Z-CDW. In this connection a mechanism is proposed forbringing the concave curvature in the temperature dependence of the wavenumber, which is observed in 2H-TaSe..
- 社団法人日本物理学会の論文
- 1979-05-15
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関連論文
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