Antiferromagnetic and van Hove Scenarios for the cuprates: Taking the best of both worlds
Antiferromagnetic and van Hove Scenarios for the cuprates: Taking the best of both worlds
复制标题
DOI：
10.1103/physrevlett.74.310
复制
发表时间：
1994-07
影响因子：
2
通讯作者：
E. Dagotto;A. Nazarenko;A. Moreo
中科院分区：
文献类型：
--
作者：
E. Dagotto;A. Nazarenko;A. Moreo
提出了高温超导体的理论。利用数值和解析技术计算了二维t-J模型中载流子的色散，并与最近报道的X点和Y点附近平坦色散的光电发射实验结果进行了比较。理论和实验结果很吻合。这些被修饰的准粒子的态密度（DOS）具有范霍夫奇点。从反铁磁体的双载流子问题出发，提出了空穴的有效哈密顿量。该有效模型在dx2−y2通道中具有超导性，临界温度Tc ~ 100Kat，最佳空穴密度x = 0.15，准粒子寿命与能量线性相关。最佳浓度的出现是DOS中范霍夫奇点的结果。其他实验结果也定量地再现了该理论。目前的贡献是基于作者最近的两篇论文(物理。Rev. letter .73, 728（1994）和nhml1994年7月预印本)。
A theory for the high temperature superconductors is proposed. The dispersion of carriers in the 2D t-J model is calculated using numerical and analytical techniques, and compared with recent photoemission experimental results that reported a flat dispersion near the X and Y points. Good agreement is observed between theory and experiments. The density of states (DOS) of these dressed quasiparticles has a van Hove singularity. From the two carriers problem in an antiferromagnet, an effective Hamiltonian for holes is proposed. This effective model has superconductivity in the dx2−y2 channel, a critical temperature Tc ∼ 100Kat the optimal hole density, x = 0.15, and a quasiparticle lifetime linearly dependent with energy. The appearance of an optimal concentration is a consequence of the van Hove singularity in the DOS. Other experimental results are also quantitatively reproduced by the theory. The present contribution is based on two recent papers by the authors (Phys. Rev. Lett.73, 728 (1994) and NHMFL preprint, July 1994).