Fragility of the Antiferromagnetic Long-Range-Order and Spin Correlation in the Two-Dimentional t-J Model

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概要

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• The two dimensional (2D) t-J model is studied in a Green's function decouplingscheme, which is an extension of the Kondo and Yamaji's theory (KY theory). TheKY theory was originally proposed for spin systems, and is applicable to cases inwhich there is no symmetry breaking. We derive the lowest order corrections by theelectron hopping energy t to self-consistent equations for the correlation function.Hole concentration dependences of the antiferromagnetic (AF) long-range-order(LRO) and spin correlation length at zero temperature are obtained. It is found thatthey decrease sensitively with doping holes even in a situation very favorable for theantiferromagnetism, The critical hole concentration at which AF LRO vanishes is esti-mated to be much smaller than in the three-dimensional case. A characteristic featureof 2D electron systems with strong correlations is discussed.

• 社団法人日本物理学会の論文
• 1992-03-15

著者

• TAKADA Satoshi

  Institute of Physics,University of Tsukuba

• Shimahara Hiroshi

  Faculty Of Integrated Arts And Sciences Hiroshima University

• Takada Satoshi

  Institute Of Physics University Of Tsukuba

• Takada Satoshi

  Institute For Solid States Physics University Of Tokyo : Department Of Physics College Of General Education University Of Tokyo

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