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Abstract
We adopt a t 1– t 2– t 3– J– G model for explanation of x≈ 1 8 anomaly in HTSC compounds. The calculated charge susceptibility has a maximum near ( π, π) leading to charge density wave (CDW) formation with the CDW amplitude e Q = x in very narrow band regime at intermediate temperatures and near ( π, π/2) as temperature approaches zero. The in-phase domain structure as a candidate for “stripe” picture is proposed. We propose an experiment to apply pressure, and predict fast increase of T c at anomalous value x≈ 1 8 in the presence of CDW. The enhancement of T c will decline when CDW are suppressed by pressure.
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