ASPECTS OF THE PHASE-DIAGRAM OF THE 2-DIMENSIONAL T-J MODEL

被引：153
|
作者：
PUTIKKA, WO
LUCHINI, MU
RICE, TM
机构：
[1] Theoretische Physik, Eidgenössische Technische Hochschule Hönggerberg
来源：
PHYSICAL REVIEW LETTERS | 1992年 / 68卷 / 04期
关键词：
D O I：
10.1103/PhysRevLett.68.538
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The phase diagram of the 2D t-J model is investigated using high-temperature expansions. Series for the Helmholtz free energy, the inverse compressibility, the chemical potential, and the uniform spin susceptibility through tenth order are calculated and analyzed. A region of phase separation is found at T = 0 for J/t lying above a line extending from J/t = 3.8 at zero filling to J/t = 1.2 at half filling. For very small J/t near half filling where the Nagaoka effect is possible, we find a region of divergent uniform magnetic susceptibility at T = 0.
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页码：538 / 541
页数：4
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