Abstract

The pseudogap phase of HTSC cuprates is associated with the formation of a system of quantum electron–hole (EH) dimers similar to the Anderson RVB phase. A specific role of the electron–lattice relaxation in the formation of metastable EH dimers in cuprates with the T and T ' structures is considered. An effective spin–pseudospin Hamiltonian of the CuO₂ plane of cuprate is introduced in the model of charge triplets and S = 1 the pseudospin formalism. In the molecular-field approximation (MFA), for the coordinate representation, the main MFA phases have been found: antiferromagnetic insulator, charge density wave, boson superconductor with the d-symmetry of the order parameter, and two metallic Fermi-phases that form the “strange”-metal phase. MFA is shown to enable, as a whole, a proper description of the features of the phase diagrams typical of cuprates. As in the case of typical s = 1/2 quantum antiferromagnet, the actually observed cuprate phases such as the charge ordering and the superconductivity reflect a “physical” ground state close to MFA phases but with strongly reduced values of local order parameters.

中文翻译：

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HTSC铜酸盐的Pseeudogap阶段的性质

摘要

HTSC铜酸盐的假间隙相与类似于安德森RVB相的量子电子-空穴（EH）二聚体系统的形成有关。考虑了电子-晶格弛豫在具有T和T '结构的铜酸盐中形成亚稳态EH二聚体的特定作用。在电荷三重态模型中引入了一种有效的自旋-伪自旋CuO ₂平面的哈密​​顿量，S = 1为自旋形式。在分子场近似（MFA）中，对于坐标表示，发现了主要的MFA相：反铁磁绝缘体，电荷密度波，具有d的玻色子超导体。阶参数的对称性，以及形成“奇怪”金属相的两个金属费米相。总体而言，MFA被证明可以正确描述典型的铜酸盐相图的特征。在典型的s = 1/2量子反铁磁体的情况下，实际观察到的铜酸盐相（例如电荷有序和超导性）反映了接近MFA相的“物理”基态，但局部有序参数的值却大大降低。