Phase Separation in the Two-Dimensional Systems of Strongly Correlated Electrons: The Role of Spin Singlet Pairs on Hole Pairing Contribution to Hole-Rich Phase

Abstract:

By paying attention to the hole-doped two-dimensional systems of antiferromagnetically (strongly) correlated electrons, we discuss the cause of hole-rich phase formation in association with phase separation. We show that the phase diagram obtained from Maxwell's construction in the plane of temperature vs. hole density is consistent with one derived from the evaluation of hole-rich and electron-rich phases in real space. We observe that the formation of a hole-rich phase is attributed to the aggregation of hole pairs induced by spin singlet pairs present in the pseudogap phase, and that the direct involvement of correlations between hole pairs is not essential for phase separation.

• Periodical: Key Engineering Materials (Volumes 277-279)
• Pages: 1011-1016
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.277-279.1011
• Online since: January 2005
• Authors: Sung Sik Lee, Sul Ah Ahn, Sung Ho Suck Salk
• Keywords: Antiferromagnetically (Strongly) Correlated Electrons, Electron-Rich Phase, Hole-Rich Phase, Maxwell's Construction, Phase Separation, Pseudogap Phase, Spin Singlet Pair

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